12=-3(9+n)

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Solution for 12=-3(9+n) equation: 



12=-3(9+n)

We move all terms to the left:

12-(-3(9+n))=0

We add all the numbers together, and all the variables

-(-3(n+9))+12=0



We calculate terms in parentheses: -(-3(n+9)), so:

-3(n+9)

We multiply parentheses

-3n-27

Back to the equation:

-(-3n-27)



We get rid of parentheses

3n+27+12=0

We add all the numbers together, and all the variables

3n+39=0

We move all terms containing n to the left, all other terms to the right

3n=-39

n=-39/3

n=-13

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