Example

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

Question

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

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