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12(x+8)=13(x-9)
We move all terms to the left:
12(x+8)-(13(x-9))=0
We multiply parentheses
12x-(13(x-9))+96=0
We calculate terms in parentheses: -(13(x-9)), so:We get rid of parentheses
13(x-9)
We multiply parentheses
13x-117
Back to the equation:
-(13x-117)
12x-13x+117+96=0
We add all the numbers together, and all the variables
-1x+213=0
We move all terms containing x to the left, all other terms to the right
-x=-213
x=-213/-1
x=+213
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