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25=n/3+13
We move all terms to the left:
25-(n/3+13)=0
We get rid of parentheses
-n/3-13+25=0
We multiply all the terms by the denominator
-n-13*3+25*3=0
We add all the numbers together, and all the variables
-1n+36=0
We move all terms containing n to the left, all other terms to the right
-n=-36
n=-36/-1
n=+36
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