Example

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

Question

$$( \frac { - 12 } { 19 } ) ^ { 7 } \div ( - \frac { 12 } { 19 } ) ^ { 5 }$$

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