-2m-12=9+m

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Solution for -2m-12=9+m equation: 



-2m-12=9+m

We move all terms to the left:

-2m-12-(9+m)=0

We add all the numbers together, and all the variables

-2m-(m+9)-12=0

We get rid of parentheses

-2m-m-9-12=0

We add all the numbers together, and all the variables

-3m-21=0

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

-3m=21

m=21/-3

m=-7

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