6b-21=-9+2b

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Solution for 6b-21=-9+2b equation: 



6b-21=-9+2b

We move all terms to the left:

6b-21-(-9+2b)=0

We add all the numbers together, and all the variables

6b-(2b-9)-21=0

We get rid of parentheses

6b-2b+9-21=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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