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72=6(n+9)
We move all terms to the left:
72-(6(n+9))=0
We calculate terms in parentheses: -(6(n+9)), so:We get rid of parentheses
6(n+9)
We multiply parentheses
6n+54
Back to the equation:
-(6n+54)
-6n-54+72=0
We add all the numbers together, and all the variables
-6n+18=0
We move all terms containing n to the left, all other terms to the right
-6n=-18
n=-18/-6
n=+3
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