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