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13=n/7+10
We move all terms to the left:
13-(n/7+10)=0
We get rid of parentheses
-n/7-10+13=0
We multiply all the terms by the denominator
-n-10*7+13*7=0
We add all the numbers together, and all the variables
-1n+21=0
We move all terms containing n to the left, all other terms to the right
-n=-21
n=-21/-1
n=+21
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