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

Вычислим корни.

1) 2 * х + 9 = 2 * х - 4;

2 * x - 2 * x = - 9 - 4;

0 * x = - 13;

Нет корней.

2) 9 * (х - 1) = х + 15;

9 * x - 9 = x + 15;

9 * x - x = 15 + 9;

8 * x = 24;

x = 24/8;

x = 3.

3) (11 * х + 14) - (5 * х - 8) = 25;

11 * x + 14 - 5 * x + 8 = 25;

11 * x - 5 * x + 22 = 25;

6 * x + 22 = 25;

6 * x = 25 - 22;

6 * x = 3;

x = 3/6;

x = 1/2.

4) 12 - 4 * (х - 3) = 39 - 9 * х;

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

12 - 4 * x + 12 = 39 - 9 * x;

24 - 4 * x = 39 - 9 * x;

-4 * x + 9 * x = 39 - 24;

5 * x = 15;

x = 3.

5) 2 * (3 * х + 5) - 3 * (4 * х - 1) = 121;

6 * x + 10 - 12 * x + 3 = 121;

-6 * x + 13 = 121;

-6 * x = 121 - 13;

-6 * x = 108;

x = - 108/6;

x = - 18.