-2+21=m-9

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



-2+21=m-9

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(m-9)+19=0

We get rid of parentheses

-m+9+19=0

We add all the numbers together, and all the variables

-1m+28=0

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

-m=-28

m=-28/-1

m=+28

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