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(2x+2)(x+3)(x)=126
We move all terms to the left:
(2x+2)(x+3)(x)-(126)=0
We multiply parentheses ..
(+2x^2+6x+2x+6)x-126=0
We multiply parentheses
2x^3+6x^2+2x^2+6x-126=0
We do not support expression: x^3
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