-3n-3n=12

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Solution for -3n-3n=12 equation: 



-3n-3n=12

We move all terms to the left:

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

We add all the numbers together, and all the variables

-6n-12=0

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

-6n=12

n=12/-6

n=-2

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