\left. \begin{array} { l } { ( \frac { 3 } { 4 } a ^ { 2 } b - \frac { 1 } { 7 } a b ^ { 2 } ) - ( \frac { 1 } { 6 } a ^ { 2 } b + \frac { 3 } { 2 } a b ^ { 2 } ) } \\ { ( \frac { 3 } { 2 } a ^ { 5 } b ^ { 4 } - \frac { 1 } { 3 } a ^ { 4 } b ^ { 5 } ) - ( \frac { 8 } { 5 } a ^ { 5 } b ^ { 4 } - \frac { 3 } { 2 } a ^ { 2 } ) } \end{array} \right.
Evaluate
\frac{7ba^{2}}{12}-\frac{23ab^{2}}{14},\ -\frac{a^{4}b^{5}}{3}-\frac{b^{4}a^{5}}{10}+\frac{3a^{2}}{2}
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