5.175 Решите уравнение: a) x - \frac{7}{13} = \frac{2}{13}; б) \frac{13}{17} - y = \frac{3}{17}; в) z + \frac{7}{21} = \frac{13}{21}; г) \frac{9}{29} + = \frac{5}{29}.

1. \(x - \frac{7}{13} = \frac{2}{13}\)
   \(x = \frac{2}{13} + \frac{7}{13}\)
   \(x = \frac{9}{13}\)

Ответ: \(\frac{9}{13}\)

2. \(\frac{13}{17} - y = \frac{3}{17}\)
   \(y = \frac{13}{17} - \frac{3}{17}\)
   \(y = \frac{10}{17}\)

Ответ: \(\frac{10}{17}\)

3. \(z + \frac{7}{21} = \frac{13}{21}\)
   \(z = \frac{13}{21} - \frac{7}{21}\)
   \(z = \frac{6}{21} = \frac{2}{7}\)

Ответ: \(\frac{2}{7}\)