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