Example

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

Question

$$2.1 { x }^{ 3 } +3.2 { x }^{ 2 } +5-3x+1.9 { x }^{ 3 } -1.2 { x }^{ 2 } +2x-1$$

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