9=21-4b

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Solution for 9=21-4b equation: 



9=21-4b

We move all terms to the left:

9-(21-4b)=0

We add all the numbers together, and all the variables

-(-4b+21)+9=0

We get rid of parentheses

4b-21+9=0

We add all the numbers together, and all the variables

4b-12=0

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

4b=12

b=12/4

b=3

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