9+m=-9-2m

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



9+m=-9-2m

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

m+2m+9+9=0

We add all the numbers together, and all the variables

3m+18=0

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

3m=-18

m=-18/3

m=-6

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