Example

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

Question

$$x ( - 5 ) ^ { - x - 1 } \times ( - 5 ) ^ { 5 } = ( - 5 ) ^ { 7 }$$

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