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1008=(30-20x)(20-2x)(x)
We move all terms to the left:
1008-((30-20x)(20-2x)(x))=0
We add all the numbers together, and all the variables
-((-20x+30)(-2x+20)x)+1008=0
We multiply parentheses ..
-((+40x^2-400x-60x+600)x)+1008=0
We calculate terms in parentheses: -((+40x^2-400x-60x+600)x), so:
(+40x^2-400x-60x+600)x
We multiply parentheses
40x^3-400x^2-60x^2+600x
We do not support expression: x^3
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