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13=8n+5n
We move all terms to the left:
13-(8n+5n)=0
We add all the numbers together, and all the variables
-(+13n)+13=0
We get rid of parentheses
-13n+13=0
We move all terms containing n to the left, all other terms to the right
-13n=-13
n=-13/-13
n=1
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