Ответ:

\(\frac{7}{8}-\frac{17}{12}=\frac{21-34}{24}=-\frac{13}{24}\).

\(-\frac{13}{24}:\frac{5}{12}=-\frac{13}{24}\cdot\frac{12}{5}=-\frac{13}{10}\).

Ответ: \(-\frac{13}{10}\).