1) (3b+2a) 2)(x+y)-(x-y) 3)(2x-3)-(2x+3)=12

Разложим на многочлен.

1) (3 * b + 2 * a) = (3 * b) + 3 * (3 * b) * 2 * a + 3 * 3 * b * (2 * a) + (2 * a) = 27 * b + 3 * 9 * b * 2 * a + 9 * b * 4 * a + 8 * a = 27 * b + 54 * b * a + 36 * b  * a + 8 * a;

2) (x + y) - (x - y) = x + 2 * x * y + y - (x - 2 * x * y + y) = x + 2 * x * y + y - x + 2 * x * y - y = 2 * x * y + 2 * x * y = 4 * x * y;

3) Найдем корень.

(2 * x - 3) - (2 * x + 3) = 12;

(2 * x) - 2 * 2 * x * 3 + 3 - ((2 * x) + 2 * 2 * x * 3 + 3) = 12;

4 * x - 12 * x + 9 (4 * x + 12 * x + 9) = 12;

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

-12 * x 12 * x = 12;

x * (-12 12) = 12;

x * (-24) = 12;

-24 * x = 12;

x = -12/24;

x = -1/2;

x = -0.5.