21+9b=6+6b

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



21+9b=6+6b

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

9b-6b-6+21=0

We add all the numbers together, and all the variables

3b+15=0

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

3b=-15

b=-15/3

b=-5

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