Ответ:
1) x = 14
2) x = -0.8
3) x = 11.5
Пошаговое объяснение:
1) 3x - 10x + 6x = 9 + 5
-x = 14
x = 14
2) -5(3x - 4) - (x + 2) = 5(6 - x)
-15x + 20 - x - 2 = 30 - x
-15x - x + x = 30 - 20 + 2
-15x = 12
x = -0.8
3) 2x - 3(2x + 5) = (4 - 3x)2
2x - 6x - 15 = 8 - 6x
2x - 6x + 6x = 8 + 15
2x = 23
x = 11.5