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99=3(n+13)
We move all terms to the left:
99-(3(n+13))=0
We calculate terms in parentheses: -(3(n+13)), so:We get rid of parentheses
3(n+13)
We multiply parentheses
3n+39
Back to the equation:
-(3n+39)
-3n-39+99=0
We add all the numbers together, and all the variables
-3n+60=0
We move all terms containing n to the left, all other terms to the right
-3n=-60
n=-60/-3
n=+20
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