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13-3n=n+1
We move all terms to the left:
13-3n-(n+1)=0
We get rid of parentheses
-3n-n-1+13=0
We add all the numbers together, and all the variables
-4n+12=0
We move all terms containing n to the left, all other terms to the right
-4n=-12
n=-12/-4
n=+3
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