222. Решите уравнение: a) $$6\frac{2}{13} - x = 3\frac{7}{13}$$; б) $$y - 5\frac{8}{9} = 3\frac{5}{9}$$; в) $$(z + 2\frac{4}{11}) - 4\frac{7}{11} = 1\frac{6}{11}$$

a) $$6\frac{2}{13} - x = 3\frac{7}{13}$$ $$x = 6\frac{2}{13} - 3\frac{7}{13}$$ $$x = 5\frac{15}{13} - 3\frac{7}{13}$$ $$x = 2\frac{8}{13}$$ б) $$y - 5\frac{8}{9} = 3\frac{5}{9}$$ $$y = 3\frac{5}{9} + 5\frac{8}{9}$$ $$y = 8\frac{13}{9} = 8 + 1\frac{4}{9}$$ $$y = 9\frac{4}{9}$$ в) $$(z + 2\frac{4}{11}) - 4\frac{7}{11} = 1\frac{6}{11}$$ $$z + 2\frac{4}{11} = 1\frac{6}{11} + 4\frac{7}{11}$$ $$z + 2\frac{4}{11} = 5\frac{13}{11} = 6\frac{2}{11}$$ $$z = 6\frac{2}{11} - 2\frac{4}{11} = 5\frac{13}{11} - 2\frac{4}{11}$$ $$z = 3\frac{9}{11}$$