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x(x+1)(x+2)=-720
We move all terms to the left:
x(x+1)(x+2)-(-720)=0
We add all the numbers together, and all the variables
x(x+1)(x+2)+720=0
We multiply parentheses ..
x(+x^2+2x+x+2)+720=0
We multiply parentheses
x^3+2x^2+x^2+2x+720=0
We do not support expression: x^3
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