21-3m=9

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Solution for 21-3m=9 equation: 



21-3m=9

We move all terms to the left:

21-3m-(9)=0

We add all the numbers together, and all the variables

-3m+12=0

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

-3m=-12

m=-12/-3

m=+4

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