Example

3(r+2s)=2t-4
a⋅(b-2)=3b
3(r+2s)=2t-4
a⋅(b-2)=3b

Question

$$( \frac { - 2 a } { - a ^ { - 3 } b ^ { - 2 } \cdot - a ^ { 4 } b ^ { 3 } } ) ^ { - 3 }$$

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