a) $$14-\frac{6}{9} = 13\frac{9}{9} -\frac{6}{9} = 13\frac{3}{9} = 13\frac{1}{3}$$
б) $$82 - \frac{7}{15} = 81\frac{15}{15} - \frac{7}{15} = 81\frac{8}{15}$$
Ответ: a) $$13\frac{1}{3}$$; б) $$81\frac{8}{15}$$