\[4\frac{2}{3} + \left( - 2\frac{8}{15} \right) - \left( - 2\frac{3}{5} \right) =\]
\[= 4\frac{10}{15} - 2\frac{8}{15} + 2\frac{9}{15} =\]
\[= 2\frac{2}{15} + 2\frac{9}{15} = \ 4\frac{11}{15}\]