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9n=3n-1
We move all terms to the left:
9n-(3n-1)=0
We get rid of parentheses
9n-3n+1=0
We add all the numbers together, and all the variables
6n+1=0
We move all terms containing n to the left, all other terms to the right
6n=-1
n=-1/6
n=-1/6
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