1 - 8(10 - x) = 9
1 - 80 + 8x = 9
8x - 79 = 9
8x = 88
x = 11
4(5x - 7) - 3 = 9x - 9
20x - 28 - 3 = 9x - 9
20x - 31 = 9x - 9
20x - 9x = 31 - 9
11x = 22
x = 2
Ответ: 1) x = 11, 2) x = 2