\[\left( 6\frac{2}{9} - 5\frac{5}{6} \right)\ :\left( - \frac{7}{36} \right) =\]
\[= \left( 6\frac{4}{18} - 5\frac{15}{18} \right) \cdot \left( - \frac{36}{7} \right) =\]
\[= \left( 5\frac{22}{18} - 5\frac{15}{18} \right) \cdot \left( - \frac{36}{7} \right) =\]
\[= \frac{7}{18} \cdot \left( - \frac{36}{7} \right) = - 2\]