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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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