Simplify $\left( \frac { x + 4 } { 12 x - 3 x ^ { 2 } } \right) \div \left( \frac { 1 } { x } - \frac { 2 } { x - 4 } \right)$

question 76

Essay

Simplify: $\left( \frac { x + 4 } { 12 x - 3 x ^ { 2 } } \right) \div \left( \frac { 1 } { x } - \frac { 2 } { x - 4 } \right)$

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