0.5(4+x) - 0.4(x-3) = 2.52 + 0.5x - 0.4x + 1.2 = 2.52 + 0.1x + 1.2 = 2.53.2 + 0.1x = 2.50.1x = 2.5 - 3.20.1x = -0.7x = -0.7 / 0.1x = -7
Ответ: x = -7
0.5(4+x) - 0.4(x-3) = 2.5
2 + 0.5x - 0.4x + 1.2 = 2.5
2 + 0.1x + 1.2 = 2.5
3.2 + 0.1x = 2.5
0.1x = 2.5 - 3.2
0.1x = -0.7
x = -0.7 / 0.1
x = -7
Ответ: x = -7