7m-4m=-21

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Solution for 7m-4m=-21 equation: 



7m-4m=-21

We move all terms to the left:

7m-4m-(-21)=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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