7x - 8 = 2x + 17
7x - 2x = 17 + 8
5x = 25
x = 5
2x = 3(2x + 1) + 5
2x = 6x + 3 + 5
2x - 6x = 8
-4x = 8
x = -2
7(2x + 3) + x = 4x - 12
14x + 21 + x = 4x - 12
15x - 4x = -12 - 21
11x = -33
x = -3
7x - 3(4x - 3) = 7(3x + 5)
7x - 12x + 9 = 21x + 35
-5x - 21x = 35 - 9
-26x = 26
x = -1
5(2 - 5x) - 7(4x - 1) = 6x - 42
10 - 25x - 28x + 7 = 6x - 42
-53x - 6x = -42 - 17
-59x = -59
x = 1
2(8x - 1) - 8(2x - 3) = 13
16x - 2 - 16x + 24 = 13
22 = 13
Решений нет