Решите 9*(х-1)=х+15 (11х+14)-(5х-8)=25 12-4(х-3)=39-9х 2(3х+5)-3(4х-1)=121

1) 9 * (х - 1) = х + 15.

9 * x - 9 * 1 = x + 15.

9x - 9 = x + 15.

9x - x = 15 + 9.

8x = 24.

x = 24 : 8 = 3,

Ответ: х = 3.

2) (11х + 14) - (5х - 8) = 25.

11x + 14 - 5x + 8 = 25.

x (11 - 5) + 22 = 25.

6x = 25 - 22.

6x = 3.

x = 3/6 = 1/2.

Ответ: х = 1/2.

3) 12 - 4 (х - 3) = 39 - 9х.

12 - 4 * x + 3 * 4 = 39 - 9x.

12 - 4x + 12 + 9x = 39.

x (9 - 4) = 39 - 24.

5x = 15.

x = 15 : 5 = 3,

Ответ: х = 3.

4) 2 (3х + 5) - 3 (4х - 1) = 121.

2 * 3x + 2 * 5 - 3 * 4x + 3 * 1 = 121.

6x + 10 - 12x + 3 = 121.

x (6 - 12) = 121 - 10 - 3.

- 6x = 108.

x = - 108 : 6 = - 18,

Ответ: х = - 18.