Example

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

Question

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

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