-5m+12=21-2m

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Solution for -5m+12=21-2m equation: 



-5m+12=21-2m

We move all terms to the left:

-5m+12-(21-2m)=0

We add all the numbers together, and all the variables

-5m-(-2m+21)+12=0

We get rid of parentheses

-5m+2m-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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