1.7x + 2.3 - (4.2x + 0.9 - (2.9x - 1.4)) = 1.7x + 2.3 - 4.2x - 0.9 + 2.9x - 1.4 = (1.7x - 4.2x + 2.9x) + (2.3 - 0.9 - 1.4) = 0.4x + 0 = 0.4x = x = 9 / 0.x = 22.5
Ответ: x = 22.5
1.7x + 2.3 - (4.2x + 0.9 - (2.9x - 1.4)) =
1.7x + 2.3 - 4.2x - 0.9 + 2.9x - 1.4 =
(1.7x - 4.2x + 2.9x) + (2.3 - 0.9 - 1.4) =
0.4x + 0 =
0.4x =
x = 9 / 0.
x = 22.5
Ответ: x = 22.5