7m-21=42m=

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Solution for 7m-21=42m= equation: 



7m-21=42m=

We move all terms to the left:

7m-21-(42m)=0

We add all the numbers together, and all the variables

-35m-21=0

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

-35m=21

m=21/-35

m=-3/5

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