-3m-4m=21

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Solution for -3m-4m=21 equation: 



-3m-4m=21

We move all terms to the left:

-3m-4m-(21)=0

We add all the numbers together, and all the variables

-7m-21=0

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

-7m=21

m=21/-7

m=-3

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