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4=4+4n-n
We move all terms to the left:
4-(4+4n-n)=0
We add all the numbers together, and all the variables
-(3n+4)+4=0
We get rid of parentheses
-3n-4+4=0
We add all the numbers together, and all the variables
-3n=0
n=0/-3
n=0
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