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