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x(6-x)(x+9)=0
We add all the numbers together, and all the variables
x(-1x+6)(x+9)=0
We multiply parentheses ..
x(-1x^2-9x+6x+54)=0
We multiply parentheses
-1x^3-9x^2+6x^2+54x=0
We do not support expression: x^3
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