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13n-13=16n-28
We move all terms to the left:
13n-13-(16n-28)=0
We get rid of parentheses
13n-16n+28-13=0
We add all the numbers together, and all the variables
-3n+15=0
We move all terms containing n to the left, all other terms to the right
-3n=-15
n=-15/-3
n=+5
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