1. Решите уравнения: а) \(\left(x-3\frac{13}{21}\right)+2\frac{10}{21}=7\frac{2}{21}\); б) \(\left(x-3\frac{12}{17}\right)-8\frac{9}{17}=4\frac{10}{17}\).

а)

\(x-3\frac{13}{21}=7\frac{2}{21}-2\frac{10}{21}=4\frac{13}{21}\).

\(x=4\frac{13}{21}+3\frac{13}{21}=8\frac{26}{21}=9\frac{5}{21}\).

Ответ: \(x=9\frac{5}{21}\).

б)

\(x-3\frac{12}{17}=4\frac{10}{17}+8\frac{9}{17}=12\frac{19}{17}=13\frac{2}{17}\).

\(x=13\frac{2}{17}+3\frac{12}{17}=16\frac{14}{17}\).

Ответ: \(x=16\frac{14}{17}\).