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-13=x/2-7
We move all terms to the left:
-13-(x/2-7)=0
We get rid of parentheses
-x/2+7-13=0
We multiply all the terms by the denominator
-x+7*2-13*2=0
We add all the numbers together, and all the variables
-1x-12=0
We move all terms containing x to the left, all other terms to the right
-x=12
x=12/-1
x=-12
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