Example

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

Question

$$(6-9 { x }^{ 2 } +5x-2)-( { x }^{ 2 } -8x+1)-(2 { x }^{ 2 } +4x-6)$$

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