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x(x+2)(x+-4)=0
We add all the numbers together, and all the variables
x(x+2)(x-4)=0
We multiply parentheses ..
x(+x^2-4x+2x-8)=0
We multiply parentheses
x^3-4x^2+2x^2-8x=0
We do not support expression: x^3
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