2m+21=9m-7

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Solution for 2m+21=9m-7 equation: 



2m+21=9m-7

We move all terms to the left:

2m+21-(9m-7)=0

We get rid of parentheses

2m-9m+7+21=0

We add all the numbers together, and all the variables

-7m+28=0

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

-7m=-28

m=-28/-7

m=+4

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