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18=5n+13
We move all terms to the left:
18-(5n+13)=0
We get rid of parentheses
-5n-13+18=0
We add all the numbers together, and all the variables
-5n+5=0
We move all terms containing n to the left, all other terms to the right
-5n=-5
n=-5/-5
n=1
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