Решите уравнение 1) 9x + (7x+5) - (2x-3) = x+7 2) 3x - (8+9x) - (5x-4) = -7x 3) x-15,5+8x - (13x+16,5) = 12x 4) 6x - (2x+13) - (x-7) = 15x

Решим уравнения:

1) 9 * x + (7 * x + 5) - (2 * x - 3) = x + 7;

9 * x + 7 * x + 5 - 2 * x + 3 = x + 7;

16 * x + 5 - 2 * x + 3 = x + 7;

14 * x + 8 = x + 7;

14 * x - x = 7 - 8;

13 * x = - 1;

x = - 1/13.

2) 3 * x - (8 + 9 * x) - (5 * x - 4) = - 7 * x;

3 * x - 8 - 9 * x - 5 * x + 4 = - 7 * x;

-6 * x - 8 - 5 * x + 4 = - 7 * x;

-11 * x - 4 = - 7 * x;

-11 * x + 7 * x = 4;

-4 * x = 4;

x = - 4/4;

x = - 1.

3) x - 15,5 + 8 * x - (13 * x + 16,5) = 12 * x;

x - 15.5 + 8 * x - 13 * x - 16.5 = 12 * x;

9 * x - 13 * x - 32 = 12 * x;

-4 * x - 32 = 12 * x;

-4 * x - 12 * x = - 32;

16 * x = 32;

x = 2.

4) 6 * x - (2 * x + 13) - (x - 7) = 15 * x;

6 * x - 2 * x - 13 - x + 7 = 15 * x;

3 * x - 6 = 15 * x;

3 * x - 15 * x = 6;

-12 * x = 6;

x = - 6/12;

x = - 1/2.