-7m+21=42

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Solution for -7m+21=42 equation: 



-7m+21=42

We move all terms to the left:

-7m+21-(42)=0

We add all the numbers together, and all the variables

-7m-21=0

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

-7m=21

m=21/-7

m=-3

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