12m+21=9

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Solution for 12m+21=9 equation: 



12m+21=9

We move all terms to the left:

12m+21-(9)=0

We add all the numbers together, and all the variables

12m+12=0

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

12m=-12

m=-12/12

m=-1

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