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(x)(x+12)=(x+12)(x+5)
We move all terms to the left:
(x)(x+12)-((x+12)(x+5))=0
We multiply parentheses
x^2+12x-((x+12)(x+5))=0
We multiply parentheses ..
x^2-((+x^2+5x+12x+60))+12x=0
We calculate terms in parentheses: -((+x^2+5x+12x+60)), so:We add all the numbers together, and all the variables
(+x^2+5x+12x+60)
We get rid of parentheses
x^2+5x+12x+60
We add all the numbers together, and all the variables
x^2+17x+60
Back to the equation:
-(x^2+17x+60)
x^2+12x-(x^2+17x+60)=0
We get rid of parentheses
x^2-x^2+12x-17x-60=0
We add all the numbers together, and all the variables
-5x-60=0
We move all terms containing x to the left, all other terms to the right
-5x=60
x=60/-5
x=-12
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