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7=1+2n+8
We move all terms to the left:
7-(1+2n+8)=0
We add all the numbers together, and all the variables
-(2n+9)+7=0
We get rid of parentheses
-2n-9+7=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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