\left. \begin{array} { l } { \frac { 2 a - c } { 4 c } - \frac { 3 a ^ { 2 } - 2 b c } { 6 a c } - \frac { 3 a } { b } + \frac { 5 a - b } { 2 b } - \frac { 4 b + a } { 8 b } } \\ { 3 c - 2 b \quad a - 4 b \quad 5 a - c \quad 2 c - 3 b } \end{array} \right.
Evaluate
\frac{8b^{2}-30ab-15a^{2}}{24ab},\ 3c-cc_{2}-3b-4ab_{5}-2ab
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