$\frac{-\frac{1}{2}-\frac{2}{3}+\frac{4}{5}-\frac{1}{3}+\frac{1}{5}+\frac{3}{4}}{{\displaystyle \frac{1}{2}}+{\displaystyle \frac{2}{3}}-{\displaystyle \frac{4}{3}}+{\displaystyle \frac{1}{3}}-{\displaystyle \frac{1}{5}}-{\displaystyle \frac{4}{5}}}$ का सरलीकृत रूप है -