12+9=6-3n

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Solution for 12+9=6-3n equation: 



12+9=6-3n

We move all terms to the left:

12+9-(6-3n)=0

We add all the numbers together, and all the variables

-(-3n+6)+12+9=0

We add all the numbers together, and all the variables

-(-3n+6)+21=0

We get rid of parentheses

3n-6+21=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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