21=9-6b

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Solution for 21=9-6b equation: 



21=9-6b

We move all terms to the left:

21-(9-6b)=0

We add all the numbers together, and all the variables

-(-6b+9)+21=0

We get rid of parentheses

6b-9+21=0

We add all the numbers together, and all the variables

6b+12=0

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

6b=-12

b=-12/6

b=-2

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