9+3m=2m-12

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Solution for 9+3m=2m-12 equation: 



9+3m=2m-12

We move all terms to the left:

9+3m-(2m-12)=0

We get rid of parentheses

3m-2m+12+9=0

We add all the numbers together, and all the variables

m+21=0

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

m=-21

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