Example

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

Question

$$( \frac{ 1 }{ { x }^{ 2 } } - \frac{ 1 }{ { y }^{ 2 } } )/ \frac{ x+y }{ xy }$$

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