е) \( \frac{3}{5} - \frac{6}{7} - \frac{1}{7} + \frac{1}{8} \)

\( \frac{3}{5} - \frac{6+1}{7} + \frac{1}{8} = \frac{3}{5} - \frac{7}{7} + \frac{1}{8} = \frac{3}{5} - 1 + \frac{1}{8} = \frac{3}{5} - \frac{8}{8} + \frac{1}{8} = \frac{3}{5} - \frac{7}{8} \)