12+m=4m+21=

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Solution for 12+m=4m+21= equation: 



12+m=4m+21=

We move all terms to the left:

12+m-(4m+21)=0

We get rid of parentheses

m-4m-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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