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x(40-2x)(20-2x)=0
We add all the numbers together, and all the variables
x(-2x+40)(-2x+20)=0
We multiply parentheses ..
x(+4x^2-40x-80x+800)=0
We multiply parentheses
4x^3-40x^2-80x^2+800x=0
We do not support expression: x^3
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