1) (6+5x) - (8x+3) = -3 2) (9x-7x) - (11x-8) = -5 3) (14x-3) - (15x+15) = 10 4) (13-x) - (x+15) = 7

Решим линейные уравнения, раскрыв скобки и приведя подобные члены.

1) (6 + 5x) - (8x + 3) = - 3;

6 + 5x - 8x - 3 = - 3;

- 3x = - 3 + 3 - 6;

- 3x = - 6;

x = 6/3 = 2.

2) (9x - 7x) - (11x - 8) = - 5;

9x - 7x - 11x + 8 = - 5;

8 + 5 = 9x;

x = 13/9.

3) (14x - 3) - (15x + 15) = 10;

14x - 3 - 15x - 15 = 10;

- 18 - 10 = x;

x = - 28.

4) (13 - x) - (x + 15) = 7;

13 - x - x - 15 = 7;

- 2 - 7 = 2x;

- 9 = 2x;

x = - 9/2.