Example

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

Question

$$a ^ { 3 } - 3 a ^ { 2 } b + 3 a b ^ { 2 } - b ^ { 3 } a = 2 b = 4$$

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