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X(3+X)(1+X)=30
We move all terms to the left:
X(3+X)(1+X)-(30)=0
We add all the numbers together, and all the variables
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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