\[\left( - \frac{5}{9} + \frac{14}{15} \right)\ :\left( - \frac{17}{30} \right) =\]
\[= \left( - \frac{25}{45} + \frac{42}{45} \right)\ :\left( - \frac{17}{30} \right) =\]
\[= \left( \frac{42}{45} - \frac{25}{45} \right) \cdot \left( - \frac{30}{17} \right) =\]
\[= - \frac{17 \cdot 30}{45 \cdot 17} = - \frac{2}{3}\]