Example

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

Question

$$x y ^ { 2 } - y ^ { 2 } + x ^ { 2 } + x y ^ { 2 } - 4 y ^ { 2 } - x ^ { 2 } - 7$$

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