Example

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

Question

$$( \frac { x ^ { - 2 } y ^ { - 6 } z } { x ^ { - 5 } y ^ { 10 } z ^ { - 3 } } ) ^ { - 2 }$$

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