Question

Решите уравнения:
а) (2х + 3) – (х – (3х + 4)) =15
б) 5х – (6х – (7х–(8х–9))) =1
в) 12х – 25 = 7х + 5

Answer 1

а)
$2x + 3 - (x - 3x - 4) = 15 \ 2x + 3 - x + 3x + 4 = 15 \ 4x + 7 = 15 \ 4x = 8 \ x = 2$

Answer 2

[Решение в приложении]