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