\[\left( - \frac{7}{18} + \frac{11}{12} \right)\ :\left( - \frac{19}{48} \right) =\]
\[= \left( \frac{33}{36} - \frac{14}{36} \right)\ :\left( - \frac{19}{48} \right) =\]
\[= \frac{19}{36} \cdot \left( - \frac{48}{19} \right) = - \frac{4}{3} = - 1\frac{1}{3}\]