LEFT( \FRAC{{{a}^{2}}}{2}+\frac{{{B}^{3}}}{3}-\frac{{{c}^{3}}}{4} \right)+\left( \frac{2{{a}^{2}}}{3}+\frac{3{{b}^{3}}}{4}-\frac{4{{c}^{3}}}{5} \right)\] \[+({{a}^{2}}+{{b}^{3}}+{{c}^{3}})\] \[=\frac{13}{6}{{a}^{2}}+\frac{25}{12}{{b}^{3}}-\frac{1}{20}{{c}^{3}}\]