why is there a -25 in the current assets part of the net working capital calc

Example 2019 2020 Sales 1,000 1,200 Cost of Goods Sold 700 850 Depreciation 30 35 Interest Expense 40 50 Taxes (38%) 87.4 100.7 Profit After taxes 142.6 164.3 Capital Expenditures 40 40 Accounts Receivable 50 60 Inventories 50 60 Accounts Payable 20 25 . 2020: FCF = EBIT*(1-T) + Depreciation - CAPX - ANWC EBIT = 1,200 - 850 - 35 = 315 - T=38% - ANWC = (60+60-25) - (50+50-20) = 15 - FCF = 315 * (1-.38) + 35 - 40 - 15 = 175.3