ние: а) (z - 6).3 = 3; 7 б) 1y-1=1. 4 4 4

а)

$$(z - 6) \cdot \frac{3}{7} = 3$$

$$z - 6 = 3 : \frac{3}{7}$$

$$z - 6 = 3 \cdot \frac{7}{3}$$

$$z - 6 = 7$$

$$z = 7 + 6$$

$$z = 13$$

Ответ: z = 13

б)

$$\frac{1}{4}y - \frac{1}{4} = \frac{1}{4}$$

$$\frac{1}{4}y = \frac{1}{4} + \frac{1}{4}$$

$$\frac{1}{4}y = \frac{2}{4}$$

$$y = \frac{2}{4} : \frac{1}{4}$$

$$y = \frac{2}{4} \cdot \frac{4}{1}$$

$$y = 2$$

Ответ: y = 2