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X(X-17)-18=(X-3)(X+16
We move all terms to the left:
X(X-17)-18-((X-3)(X+16)=0
We multiply parentheses
X^2-17X-((X-3)(X+16)-18=0
We multiply parentheses ..
X^2-((+X^2+16X-3X-48)-18-17X=0
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