6m-9=-21

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Solution for 6m-9=-21 equation: 



6m-9=-21

We move all terms to the left:

6m-9-(-21)=0

We add all the numbers together, and all the variables

6m+12=0

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

6m=-12

m=-12/6

m=-2

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