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1500=(20-2x)(40-x)(x)
We move all terms to the left:
1500-((20-2x)(40-x)(x))=0
We add all the numbers together, and all the variables
-((-2x+20)(-1x+40)x)+1500=0
We multiply parentheses ..
-((+2x^2-80x-20x+800)x)+1500=0
We calculate terms in parentheses: -((+2x^2-80x-20x+800)x), so:
(+2x^2-80x-20x+800)x
We multiply parentheses
2x^3-80x^2-20x^2+800x
We do not support expression: x^3
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