Найдите сумму: -5/6+(-7/8).

\[- \frac{5}{6} + \left( - \frac{7}{8} \right) = - \left( \frac{5}{6} + \frac{7}{8} \right) =\]

\[= - \left( \frac{20}{24} + \frac{21}{24} \right) = - \frac{41}{24} = - 1\frac{17}{24}\]