Example

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

Question

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

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