9=21-3m

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Solution for 9=21-3m equation: 



9=21-3m

We move all terms to the left:

9-(21-3m)=0

We add all the numbers together, and all the variables

-(-3m+21)+9=0

We get rid of parentheses

3m-21+9=0

We add all the numbers together, and all the variables

3m-12=0

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

3m=12

m=12/3

m=4

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