-12-3m=21

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Solution for -12-3m=21 equation: 



-12-3m=21

We move all terms to the left:

-12-3m-(21)=0

We add all the numbers together, and all the variables

-3m-33=0

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

-3m=33

m=33/-3

m=-11

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