№4. Решите уравнения 1) (2х7) + (6x+1)=18 2) (4-8,2x) - (3,8x + 1) = 5

1) $$(2x - 7) + (6x + 1) = 18$$

$$2x - 7 + 6x + 1 = 18$$

$$8x - 6 = 18$$

$$8x = 18 + 6$$

$$8x = 24$$

$$x = 24 : 8$$

$$x = 3$$

Ответ: 3

2) $$(4 - 8,2x) - (3,8x + 1) = 5$$

$$4 - 8,2x - 3,8x - 1 = 5$$

$$-12x + 3 = 5$$

$$-12x = 5 - 3$$

$$-12x = 2$$

$$x = 2 : (-12)$$

$$x = -\frac{2}{12}$$

$$x = -\frac{1}{6}$$

Ответ: $$\frac{-1}{6}$$