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126=(x)(x+3)(x+4)
We move all terms to the left:
126-((x)(x+3)(x+4))=0
We multiply parentheses ..
-(x(+x^2+4x+3x+12))+126=0
We calculate terms in parentheses: -(x(+x^2+4x+3x+12)), so:
x(+x^2+4x+3x+12)
We multiply parentheses
x^3+4x^2+3x^2+12x
We do not support expression: x^3
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