-6(n+3)+21=-3n-9

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Solution for -6(n+3)+21=-3n-9 equation: 



-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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