Example

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

Question

$$9 { x }^{ 3 } -21 { x }^{ 2 } y+16x { y }^{ 2 } -4 { y }^{ 3 }$$

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