7. Решите уравнение:
a) \(\frac{x}{71} + \frac{12}{71} = \frac{68}{71}\)
\(\frac{x}{71} = \frac{68}{71} - \frac{12}{71}\)
\(\frac{x}{71} = \frac{56}{71}\)
\(x = 56\)
Ответ: 56
б) \(\frac{x}{97} - \frac{28}{97} = \frac{57}{97}\)
\(\frac{x}{97} = \frac{57}{97} + \frac{28}{97}\)
\(\frac{x}{97} = \frac{85}{97}\)
\(x = 85\)
Ответ: 85