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11-2n=2n+9
We move all terms to the left:
11-2n-(2n+9)=0
We get rid of parentheses
-2n-2n-9+11=0
We add all the numbers together, and all the variables
-4n+2=0
We move all terms containing n to the left, all other terms to the right
-4n=-2
n=-2/-4
n=1/2
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