6) 8y-(7y-142) = 51; a) (6x + 1)-(3 - 2x) = 14; 6) (6 - 2x) + 4 =-5x - 3;

Решим уравнения:

6) $$8y - (7y - 142) = 51$$

$$8y - 7y + 142 = 51$$

$$y + 142 = 51$$

$$y = 51 - 142$$

$$y = -91$$

Ответ: -91

a) $$(6x + 1) - (3 - 2x) = 14$$

$$6x + 1 - 3 + 2x = 14$$

$$8x - 2 = 14$$

$$8x = 14 + 2$$

$$8x = 16$$

$$x = 16:8$$

$$x = 2$$

Ответ: 2

6) $$(6 - 2x) + 4 = -5x - 3$$

$$6 - 2x + 4 = -5x - 3$$

$$10 - 2x = -5x - 3$$

$$-2x + 5x = -3 - 10$$

$$3x = -13$$

$$x = -\frac{13}{3} = -4\frac{1}{3}$$

Ответ: $$\frac{-13}{3}$$