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8=13+x/12
We move all terms to the left:
8-(13+x/12)=0
We add all the numbers together, and all the variables
-(x/12+13)+8=0
We get rid of parentheses
-x/12-13+8=0
We multiply all the terms by the denominator
-x-13*12+8*12=0
We add all the numbers together, and all the variables
-1x-60=0
We move all terms containing x to the left, all other terms to the right
-x=60
x=60/-1
x=-60
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