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0=x(x+1)(x-4)-84
We move all terms to the left:
0-(x(x+1)(x-4)-84)=0
We add all the numbers together, and all the variables
-(x(x+1)(x-4)-84)=0
We multiply parentheses ..
-(x(+x^2-4x+x-4)-84)=0
We calculate terms in parentheses: -(x(+x^2-4x+x-4)-84), so:
x(+x^2-4x+x-4)-84
We multiply parentheses
x^3-4x^2+x^2-4x-84
We do not support expression: x^3
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