(8,1x - 3) − (5x + 4,9) = 8,1x - 3 - 5x - 4,9 = 3,1x - 3 - 4,9 = 3,1x - 7,9
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(8,1x - 3) − (5x + 4,9) = 8,1x - 3 - 5x - 4,9 = 3,1x - 3 - 4,9 = 3,1x - 7,9