Example

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

Question

$$( a ^ { - 1 } + b ^ { - 1 } ) ^ { - 1 } = \frac { a b } { a + b }$$

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