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120=(2x)(x+1)(2x-1)
We move all terms to the left:
120-((2x)(x+1)(2x-1))=0
We multiply parentheses ..
-(2x(+2x^2-1x+2x-1))+120=0
We calculate terms in parentheses: -(2x(+2x^2-1x+2x-1)), so:
2x(+2x^2-1x+2x-1)
We multiply parentheses
4x^3-2x^2+4x^2-2x
We do not support expression: x^3
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