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3+4n+n=4n+15
We move all terms to the left:
3+4n+n-(4n+15)=0
We add all the numbers together, and all the variables
5n-(4n+15)+3=0
We get rid of parentheses
5n-4n-15+3=0
We add all the numbers together, and all the variables
n-12=0
We move all terms containing n to the left, all other terms to the right
n=12
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