а)
\((z - 6) : \frac{3}{7} = 3\)
- \(z - 6 = 3 \cdot \frac{3}{7}\)
- \(z - 6 = \frac{9}{7}\)
- \(z = \frac{9}{7} + 6\)
- \(z = \frac{9}{7} + \frac{42}{7}\)
- \(z = \frac{51}{7}\)
Ответ: \(\frac{51}{7}\)
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: 2