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16=n+3n=
We move all terms to the left:
16-(n+3n)=0
We add all the numbers together, and all the variables
-(+4n)+16=0
We get rid of parentheses
-4n+16=0
We move all terms containing n to the left, all other terms to the right
-4n=-16
n=-16/-4
n=+4
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