21-m=9+m

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Solution for 21-m=9+m equation: 



21-m=9+m

We move all terms to the left:

21-m-(9+m)=0

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

-1m-(m+9)+21=0

We get rid of parentheses

-1m-m-9+21=0

We add all the numbers together, and all the variables

-2m+12=0

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

-2m=-12

m=-12/-2

m=+6

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