9-2m=21

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Solution for 9-2m=21 equation: 



9-2m=21

We move all terms to the left:

9-2m-(21)=0

We add all the numbers together, and all the variables

-2m-12=0

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

-2m=12

m=12/-2

m=-6

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