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n=3+9n-9
We move all terms to the left:
n-(3+9n-9)=0
We add all the numbers together, and all the variables
n-(9n-6)=0
We get rid of parentheses
n-9n+6=0
We add all the numbers together, and all the variables
-8n+6=0
We move all terms containing n to the left, all other terms to the right
-8n=-6
n=-6/-8
n=3/4
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