-9=12b-2b+21

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Solution for -9=12b-2b+21 equation: 



-9=12b-2b+21

We move all terms to the left:

-9-(12b-2b+21)=0

We add all the numbers together, and all the variables

-(10b+21)-9=0

We get rid of parentheses

-10b-21-9=0

We add all the numbers together, and all the variables

-10b-30=0

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

-10b=30

b=30/-10

b=-3

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