Example

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

Question

$$A = 2 ( x - 2 ) ( - x ^ { 2 } - x + 3 ) - ( - 2 x - 1 ) ( x - 2 ) ^ { 2 }$$

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