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11=4n-9
We move all terms to the left:
11-(4n-9)=0
We get rid of parentheses
-4n+9+11=0
We add all the numbers together, and all the variables
-4n+20=0
We move all terms containing n to the left, all other terms to the right
-4n=-20
n=-20/-4
n=+5
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