-3n=12+15

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Solution for -3n=12+15 equation: 



-3n=12+15

We move all terms to the left:

-3n-(12+15)=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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