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