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1680=(x+7)(2x-2)x
We move all terms to the left:
1680-((x+7)(2x-2)x)=0
We multiply parentheses ..
-((+2x^2-2x+14x-14)x)+1680=0
We calculate terms in parentheses: -((+2x^2-2x+14x-14)x), so:
(+2x^2-2x+14x-14)x
We multiply parentheses
2x^3-2x^2+14x^2-14x
We do not support expression: x^3
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