negative cash flows of R$26,308 thousand, mainly due to an increase in the revenues; and (iii) an increase in the balance of prepayments and other assets, which led to a negative cash flows of R$5,826 thousand; and
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Payments of interest of R$5,232 thousand and income tax and social contribution paid of R$1,736 thousand, which generated a net outflow of R$6,968 thousand.
For the year ended December 31, 2019, net cash from operating activities amounted to R$26,451 thousand, primarily as a result of:
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Profit for the period of R$13,844 thousand, combined with non-cash expenses consisting primarily of an increase in provisions relating to our tax proceeding related to ISS in the amount of R$6,477 thousand, financial costs and foreign exchange, net, of R$4,687 thousand, labor incentives provisions of R$4,641 thousand, provision for compensation expenses negotiated in connection with business combination transactions amounting to R$5,230 thousand and depreciation and amortization of R$18,796 thousand. The total amount of adjustment to net income from non-cash items for the year ended December 31, 2019 amounted to R$44,844 thousand;
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Net cash from changes in operating assets and liabilities, totaled an outflow of R$24,934 thousand, principally due to: (i) an increase in the balance of accounts receivable, which led to negative cash flows of R$14,536 thousand, mainly due to an increase in the revenues; and (ii) an decrease in the balance of accounts payables, which led to negative cash flows of R$9,585 thousand; and
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Payments of interest of R$4,691 thousand and income tax and social contribution paid of R$2,612 thousand, which generated a net outflow of R$7,303 thousand.
For the year ended December 31, 2018, net cash from operating activities amounted to R$39,553 thousand, primarily as a result of:
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Profit for the period of R$19,865 thousand, combined with non-cash expenses consisting primarily of an increase in provisions of R$11,148 thousand, financial costs and foreign exchange, net, of R$5,922 thousand and depreciation and amortization of R$14,513 thousand. The total amount of adjustment to net income from non-cash items for the year ended December 31, 2018 amounted to R$38,064 thousand.
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Net cash from changes in working capital, arising from changes in operating assets and liabilities, resulting in an outflow of R$11,360 thousand, principally due to: (i) an increase in the balance of accounts receivable, which led to negative cash flows of R$4,824 thousand, mainly due to an increase in the revenues; (ii) a decrease in the balance of prepaid expenses, which led to positive cash flows of R$4,783 thousand, mainly due to the use of prepayment credit amounts made to carriers in 2017; and (iii) a decrease in the balance of accounts payables, which led to negative cash flows of R$12,361 thousand; and
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Payments of interest of R$4,654 thousand and income tax and social contribution paid of R$2,362 thousand, which generated a net inflow of R$7,016 thousand.
Net cash used in investment activities
Net cash used in investment activities increased by R$51,664 thousand, to R$61,591 thousand in 2020 from R$9,927 thousand in 2019, increase in the amount of acquisition of subsidiary net of cash by R$43,482 thousand, primarily due to the impact of the Sirena acquisition, net of cash (which amounted to R$45,344 thousand), platform acquisition in the amount of R$4,400 thousand and increase in other intangible assets in the amount of R$3,786 thousand (totaling R$8,186 thousand of variation in acquisition of intangible assets). Net cash used in investment activities decreased by R$994 thousand, to R$9,927 thousand in 2019 from R$10,921 thousand in 2018, primarily due to the payment in 2019 of the first installment for the acquisition of Total Voice, in the amount of R$1,862 thousand, acquisition of property and equipment, including equipment and hardware for use in our data centers and offices (R$2,303 thousand higher than in 2018), partially offset by liquid investments (R$4,636 thousand higher than in 2018).