21+-3m=-12

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Solution for 21+-3m=-12 equation: 



21+-3m=-12

We move all terms to the left:

21+-3m-(-12)=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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