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18=3(n+1)
We move all terms to the left:
18-(3(n+1))=0
We calculate terms in parentheses: -(3(n+1)), so:We get rid of parentheses
3(n+1)
We multiply parentheses
3n+3
Back to the equation:
-(3n+3)
-3n-3+18=0
We add all the numbers together, and all the variables
-3n+15=0
We move all terms containing n to the left, all other terms to the right
-3n=-15
n=-15/-3
n=+5
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