Решите уравнения 9х + (6 – 2х) = 15 2х – (5х + 4) = - 8 5 – 3(2х – 7) = -6х

9x + (6 - 2х) = 15
9х + 6 - 2х = 15
7х = 9
х = 9/7
х = 1 2/7
ответ:

2х - (5х + 4) = -8
2х - 5х - 4 = -8
-3х = 4
х = -4/3
х = -1 1/3
ответ:

5 - 3(2х - 7) = -6х
5 - 6х + 21 = -6х
-6х + 6х = -5 + (-21)
0х = 26