Example

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

Question

$$( a ^ { 2 } + b ^ { 2 } - 2 a b ) ( a ^ { 2 } + b ^ { 2 } + 2 a b )$$

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