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4=-n+5n
We move all terms to the left:
4-(-n+5n)=0
We add all the numbers together, and all the variables
-(+4n)+4=0
We get rid of parentheses
-4n+4=0
We move all terms containing n to the left, all other terms to the right
-4n=-4
n=-4/-4
n=1
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