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