3. Решить уравнения: A)-= Б)-=

Решение:

A) \(x - \frac{7}{9} = \frac{7}{12}\)

\(x = \frac{7}{12} + \frac{7}{9}\)

\(x = \frac{7 \times 3 + 7 \times 4}{36} = \frac{21 + 28}{36} = \frac{49}{36} = 1\frac{13}{36}\)

Б) \(\frac{11}{12} - y = \frac{7}{24}\)

\(y = \frac{11}{12} - \frac{7}{24}\)

\(y = \frac{11 \times 2 - 7}{24} = \frac{22 - 7}{24} = \frac{15}{24} = \frac{5}{8}\)