-3m-8=13

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Solution for -3m-8=13 equation: 



-3m-8=13

We move all terms to the left:

-3m-8-(13)=0

We add all the numbers together, and all the variables

-3m-21=0

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

-3m=21

m=21/-3

m=-7

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