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13=n/3+8
We move all terms to the left:
13-(n/3+8)=0
We get rid of parentheses
-n/3-8+13=0
We multiply all the terms by the denominator
-n-8*3+13*3=0
We add all the numbers together, and all the variables
-1n+15=0
We move all terms containing n to the left, all other terms to the right
-n=-15
n=-15/-1
n=+15
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