$a)\frac{11}{12}-\frac{4}{12}=\frac{7}{12}$

$b)20-\frac{3}{7}=19\frac{7}{7}-\frac{3}{7}=19\frac{4}{7}$

$c)14\frac{2}{5}-\frac{3}{5}=13\frac{7}{5}-\frac{3}{5}=13\frac{4}{5}$

$d)32-4\frac{5}{6}=31\frac{6}{6}-4\frac{5}{6}=27\frac{1}{6}$

$e)85\frac{10}{11}-26\frac{4}{11}=59\frac{6}{11}$

$f)27\frac{3}{8}-19\frac{5}{8}=26\frac{11}{8}-19\frac{5}{8}=7\frac{6}{8}=7\frac{3}{4}$