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-4=8n+18n
We move all terms to the left:
-4-(8n+18n)=0
We add all the numbers together, and all the variables
-(+26n)-4=0
We get rid of parentheses
-26n-4=0
We move all terms containing n to the left, all other terms to the right
-26n=4
n=4/-26
n=-2/13
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