Решите уравнение: 1) 9(x + 6) = 72; 2) 23(x − 12) = 552; 3) 15(2x + 11) = 285; 4) 7(123 − 4x) = 749.

1) 9(x + 6) = 72.

1. x + 6 = 72 : 9 = 8.
2. x = 8 − 6 = 2.

2) 23(x − 12) = 552.

1. x − 12 = 552 : 23 = 24.
2. x = 24 + 12 = 36.

3) 15(2x + 11) = 285.

1. 2x + 11 = 285 : 15 = 19.
2. 2x = 19 − 11 = 8.
3. x = 8 : 2 = 4.

4) 7(123 − 4x) = 749.

1. 123 − 4x = 749 : 7 = 107.
2. −4x = 107 − 123 = −16.
3. x = (−16) : (−4) = 4.

Ответ: 1) x = 2; 2) x = 36; 3) x = 4; 4) x = 4.