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