1) 7(x+8) - 25 = 667x + 56 - 25 = 667x + 31 = 667x = 35x = 5
2) 9(5x+13) - 143 = 10945x + 117 - 143 = 10945x - 26 = 10945x = 135x = 3
3) 15(13x-7) - 191 = 94195x - 105 - 191 = 94195x - 296 = 94195x = 390x = 2
Ответ: x = 5, x = 3, x = 2
1) 7(x+8) - 25 = 66
7x + 56 - 25 = 66
7x + 31 = 66
7x = 35
x = 5
2) 9(5x+13) - 143 = 109
45x + 117 - 143 = 109
45x - 26 = 109
45x = 135
x = 3
3) 15(13x-7) - 191 = 94
195x - 105 - 191 = 94
195x - 296 = 94
195x = 390
x = 2
Ответ: x = 5, x = 3, x = 2