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3(3n+)=54+6n
We move all terms to the left:
3(3n+)-(54+6n)=0
We add all the numbers together, and all the variables
3(+3n)-(6n+54)=0
We multiply parentheses
9n-(6n+54)=0
We get rid of parentheses
9n-6n-54=0
We add all the numbers together, and all the variables
3n-54=0
We move all terms containing n to the left, all other terms to the right
3n=54
n=54/3
n=18
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