Example

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

Question

$$( \frac { x ^ { 2 } y ^ { - 3 } } { z ^ { - 4 } } ) ^ { - 1 }$$

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