Example

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

Question

$$3 \times (4 { x }^{ 2 } -3x+1)+2 \times ( { x }^{ 2 } -x+5)-(3 { x }^{ 2 } -x-4)$$

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