21=6m+9

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Solution for 21=6m+9 equation: 



21=6m+9

We move all terms to the left:

21-(6m+9)=0

We get rid of parentheses

-6m-9+21=0

We add all the numbers together, and all the variables

-6m+12=0

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

-6m=-12

m=-12/-6

m=+2

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