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(x+7)(x+6)+12=(x+5)(x+9
We move all terms to the left:
(x+7)(x+6)+12-((x+5)(x+9)=0
We multiply parentheses ..
(+x^2+6x+7x+42)-((x+5)(x+9)+12=0
We get rid of parentheses
x^2+6x+7x-((x+5)(x+9)+12+42=0
We multiply parentheses ..
x^2-((+x^2+9x+5x+45)+12+42+6x+7x=0
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