12=m+9

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Solution for 12=m+9 equation: 



12=m+9

We move all terms to the left:

12-(m+9)=0

We get rid of parentheses

-m-9+12=0

We add all the numbers together, and all the variables

-1m+3=0

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

-m=-3

m=-3/-1

m=+3

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