12m+15=-21

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Solution for 12m+15=-21 equation: 



12m+15=-21

We move all terms to the left:

12m+15-(-21)=0

We add all the numbers together, and all the variables

12m+36=0

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

12m=-36

m=-36/12

m=-3

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