\[3\frac{1}{4} + \left( - 3\frac{2}{3} + \left( - 4\frac{1}{5} \right) \right) =\]
\[= 3\frac{15}{60} - \left( 3\frac{40}{60} + 4\frac{12}{60} \right) =\]
\[= 3\frac{15}{60} - 7\frac{52}{60} = - 4\frac{37}{60}\]