\[3\frac{2}{7} + 4\frac{5}{9} + 2\frac{4}{5} + 2\frac{5}{7} =\]
\[= \left( 3\frac{2}{7} + 2\frac{5}{7} \right) + \left( 4\frac{5^{\backslash 5}}{9} + 2\frac{4^{\backslash 9}}{5} \right) =\]
\[= 5\frac{7}{7} + 4\frac{25}{45} + 2\frac{36}{45} =\]
\[= 6 + 6\frac{61}{45} = 6 + 7\frac{16}{45} = 13\frac{16}{45}\]