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9(n-1)=27n
We move all terms to the left:
9(n-1)-(27n)=0
We add all the numbers together, and all the variables
-27n+9(n-1)=0
We multiply parentheses
-27n+9n-9=0
We add all the numbers together, and all the variables
-18n-9=0
We move all terms containing n to the left, all other terms to the right
-18n=9
n=9/-18
n=-1/2
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