30=21+7b-12

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Solution for 30=21+7b-12 equation: 



30=21+7b-12

We move all terms to the left:

30-(21+7b-12)=0

We add all the numbers together, and all the variables

-(7b+9)+30=0

We get rid of parentheses

-7b-9+30=0

We add all the numbers together, and all the variables

-7b+21=0

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

-7b=-21

b=-21/-7

b=+3

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