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9n-4=-11n
We move all terms to the left:
9n-4-(-11n)=0
We get rid of parentheses
9n+11n-4=0
We add all the numbers together, and all the variables
20n-4=0
We move all terms containing n to the left, all other terms to the right
20n=4
n=4/20
n=1/5
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