Решение:
a) 3(5x + 8) - 7x = 6x
15x + 24 - 7x = 6x
8x + 24 = 6x
8x - 6x = -24
2x = -24
x = -12
Ответ: -12
б) 6x - 8 = 5x - 3(x - 4)
6x - 8 = 5x - 3x + 12
6x - 8 = 2x + 12
6x - 2x = 12 + 8
4x = 20
x = 5
Ответ: 5
в) 10 - 5(2x - 1) = 7
10 - 10x + 5 = 7
15 - 10x = 7
-10x = 7 - 15
-10x = -8
x = 0,8
Ответ: 0,8
г) -x = 4 - 3(3x - 8)
-x = 4 - 9x + 24
-x = 28 - 9x
9x - x = 28
8x = 28
x = 28/8
x = 7/2
x = 3,5
Ответ: 3,5