6m+3m=21

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Solution for 6m+3m=21 equation: 



6m+3m=21

We move all terms to the left:

6m+3m-(21)=0

We add all the numbers together, and all the variables

9m-21=0

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

9m=21

m=21/9

m=2+1/3

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