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25=13+n
We move all terms to the left:
25-(13+n)=0
We add all the numbers together, and all the variables
-(n+13)+25=0
We get rid of parentheses
-n-13+25=0
We add all the numbers together, and all the variables
-1n+12=0
We move all terms containing n to the left, all other terms to the right
-n=-12
n=-12/-1
n=+12
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