3m=21-4m

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Solution for 3m=21-4m equation: 



3m=21-4m

We move all terms to the left:

3m-(21-4m)=0

We add all the numbers together, and all the variables

3m-(-4m+21)=0

We get rid of parentheses

3m+4m-21=0

We add all the numbers together, and all the variables

7m-21=0

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

7m=21

m=21/7

m=3

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