Решите уравнения: 1) 12 5/14 − x = 7 11/14; 2) y + 6 2/7 = 10 5/7; 3) 15 6/21 − (x − 4 13/21) = 9 5/21.

1) \(12\frac{5}{14}-x=7\frac{11}{14}\)

\[x=12\frac{5}{14}-7\frac{11}{14}=11\frac{19}{14}-7\frac{11}{14}=4\frac{8}{14}=4\frac{4}{7}\]

Ответ: \(x=4\frac{4}{7}\).

2) \(y+6\frac{2}{7}=10\frac{5}{7}\)

\[y=10\frac{5}{7}-6\frac{2}{7}=4\frac{3}{7}\]

Ответ: \(y=4\frac{3}{7}\).

3) \(15\frac{6}{21}-(x-4\frac{13}{21})=9\frac{5}{21}\)

\[x-4\frac{13}{21}=15\frac{6}{21}-9\frac{5}{21}=6\frac{1}{21}\]

\[x=6\frac{1}{21}+4\frac{13}{21}=10\frac{14}{21}=10\frac{2}{3}\]

Ответ: \(x=10\frac{2}{3}\).