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7-x/2=13
We move all terms to the left:
7-x/2-(13)=0
We add all the numbers together, and all the variables
-x/2-6=0
We multiply all the terms by the denominator
-x-6*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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