-2m+12=21+m

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Solution for -2m+12=21+m equation: 



-2m+12=21+m

We move all terms to the left:

-2m+12-(21+m)=0

We add all the numbers together, and all the variables

-2m-(m+21)+12=0

We get rid of parentheses

-2m-m-21+12=0

We add all the numbers together, and all the variables

-3m-9=0

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

-3m=9

m=9/-3

m=-3

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