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