3m-9=21-7m

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Solution for 3m-9=21-7m equation: 



3m-9=21-7m

We move all terms to the left:

3m-9-(21-7m)=0

We add all the numbers together, and all the variables

3m-(-7m+21)-9=0

We get rid of parentheses

3m+7m-21-9=0

We add all the numbers together, and all the variables

10m-30=0

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

10m=30

m=30/10

m=3

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