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) \(\frac{1}{4}y - \frac{1}{4} = \frac{1}{4}\)
- \(\frac{1}{4}y = \frac{1}{4} + \frac{1}{4}\)
- \(\frac{1}{4}y = \frac{2}{4}\)
- \(\frac{1}{4}y = \frac{1}{2}\)
- \(y = \frac{1}{2} : \frac{1}{4}\)
- \(y = \frac{1}{2} \cdot 4\)
- \(y = 2\)
Ответ: y = 2