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2 ( x - 1) + 4 (-5x + 8) = 12

Odpowiedź :

2(x - 1) + 4(-5x + 8) = 12

2x - 2 - 20x + 32 = 12

2x - 20x = 12 + 2 - 32

-18x = -18 / : (-18)

x = 1