Выполните действия -11/15-7/20.

\[- \frac{11}{15} - \frac{7}{20} = - \left( \frac{44}{60} + \frac{21}{60} \right) =\]

\[= - \frac{65}{60} = - \frac{13}{12} = - 1\frac{1}{12}\]