21=m-12

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Solution for 21=m-12 equation: 



21=m-12

We move all terms to the left:

21-(m-12)=0

We get rid of parentheses

-m+12+21=0

We add all the numbers together, and all the variables

-1m+33=0

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

-m=-33

m=-33/-1

m=+33

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