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0=x(50-2x)(40-2x)
We move all terms to the left:
0-(x(50-2x)(40-2x))=0
We add all the numbers together, and all the variables
-(x(-2x+50)(-2x+40))+0=0
We add all the numbers together, and all the variables
-(x(-2x+50)(-2x+40))=0
We multiply parentheses ..
-(x(+4x^2-80x-100x+2000))=0
We calculate terms in parentheses: -(x(+4x^2-80x-100x+2000)), so:
x(+4x^2-80x-100x+2000)
We multiply parentheses
4x^3-80x^2-100x^2+2000x
We do not support expression: x^3
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