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-6(n+3)+21=-3n-9
We move all terms to the left:
-6(n+3)+21-(-3n-9)=0
We multiply parentheses
-6n-(-3n-9)-18+21=0
We get rid of parentheses
-6n+3n+9-18+21=0
We add all the numbers together, and all the variables
-3n+12=0
We move all terms containing n to the left, all other terms to the right
-3n=-12
n=-12/-3
n=+4
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