3=21-2m

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Solution for 3=21-2m equation: 



3=21-2m

We move all terms to the left:

3-(21-2m)=0

We add all the numbers together, and all the variables

-(-2m+21)+3=0

We get rid of parentheses

2m-21+3=0

We add all the numbers together, and all the variables

2m-18=0

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

2m=18

m=18/2

m=9

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