12=3n-15

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Solution for 12=3n-15 equation: 



12=3n-15

We move all terms to the left:

12-(3n-15)=0

We get rid of parentheses

-3n+15+12=0

We add all the numbers together, and all the variables

-3n+27=0

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

-3n=-27

n=-27/-3

n=+9

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