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-15=-3n+8n
We move all terms to the left:
-15-(-3n+8n)=0
We add all the numbers together, and all the variables
-(+5n)-15=0
We get rid of parentheses
-5n-15=0
We move all terms containing n to the left, all other terms to the right
-5n=15
n=15/-5
n=-3
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