Example

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

Question

$$( 7 ^ { - 1 } + 8 ^ { - 1 } ) ^ { - 1 } \div 5 ^ { - 1 }$$

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