Example

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

Question

$$-9 { x }^{ 2 } y-9 { x }^{ 2 } y+6 { x }^{ 2 } y$$

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