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2n+3+n=4n+3
We move all terms to the left:
2n+3+n-(4n+3)=0
We add all the numbers together, and all the variables
3n-(4n+3)+3=0
We get rid of parentheses
3n-4n-3+3=0
We add all the numbers together, and all the variables
-n=0
n=0/-1
n=0
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