15=3n+9

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Solution for 15=3n+9 equation: 



15=3n+9

We move all terms to the left:

15-(3n+9)=0

We get rid of parentheses

-3n-9+15=0

We add all the numbers together, and all the variables

-3n+6=0

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

-3n=-6

n=-6/-3

n=+2

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