\[= 4\frac{22}{15}\ :\left( 9\frac{43}{30} - 3\frac{18}{30} \right) \cdot \frac{5}{2} =\]
\[= \frac{82}{15}\ :6\frac{25}{30} \cdot \frac{2}{5} = \frac{82}{15}\ :6\frac{5}{6} \cdot \frac{5}{2} =\]
\[= \frac{82 \cdot 6 \cdot 5}{18 \cdot 41 \cdot 2} = 2\]