Question

СРОЧНО!!! Даю 10 балов

Answer 1

2,5(x-12) = 3(x-10) - x
2,5x - 30 = 3x - 30 - x
2,5x -30 = 2x - 30
2,5x - 2x = 30 + 30
0,5x = 60
X = 60:0,5
X = 120