Example

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

Question

$$(x \times { y }^{ -y } +y { x }^{ -x } )( { x }^{ -(x+1) } + { y }^{ -(y+1) } )$$

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