Tính: \[\frac{{\left( { - \frac{5}{7} - \frac{7}{9} + \frac{9} - \frac} \right) \cdot \left( {3 - \frac{3}{4}} \right)}}{{\left( {\frac + \frac - \frac + \frac} \right):\left( {2 - \frac{2}{3}} \right)}}\].