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X(X+3)(X+1)=30
We move all terms to the left:
X(X+3)(X+1)-(30)=0
We multiply parentheses ..
X(+X^2+X+3X+3)-30=0
We multiply parentheses
X^3+X^2+3X^2+3X-30=0
We do not support eXpression: X^3
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