5. Решите уравнения: 1) x + 2/7 = 4/5 2) x - 7/20 = 3/4 3) 8/15 - x = 12/25

1) \(x + \frac{2}{7} = \frac{4}{5}\) \(x = \frac{4}{5} - \frac{2}{7}\) \(x = \frac{28}{35} - \frac{10}{35}\) \(x = \frac{18}{35}\) 2) \(x - \frac{7}{20} = \frac{3}{4}\) \(x = \frac{3}{4} + \frac{7}{20}\) \(x = \frac{15}{20} + \frac{7}{20}\) \(x = \frac{22}{20} = \frac{11}{10} = 1\frac{1}{10}\) 3) \(\frac{8}{15} - x = \frac{12}{25}\) \(x = \frac{8}{15} - \frac{12}{25}\) \(x = \frac{40}{75} - \frac{36}{75}\) \(x = \frac{4}{75}\) Ответы: 1) \(x = \frac{18}{35}\) 2) \(x = 1\frac{1}{10}\) 3) \(x = \frac{4}{75}\)