Example

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

Question

$$: ( m + n ) ^ { - 1 } ( m ^ { - 1 } + n ^ { - 1 } ) = ( m n ) ^ { - 1 }$$

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