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x(x+6)(x+-9)=0
We add all the numbers together, and all the variables
x(x+6)(x-9)=0
We multiply parentheses ..
x(+x^2-9x+6x-54)=0
We multiply parentheses
x^3-9x^2+6x^2-54x=0
We do not support expression: x^3
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