30=-9+3(b-8)

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Solution for 30=-9+3(b-8) equation: 



30=-9+3(b-8)

We move all terms to the left:

30-(-9+3(b-8))=0



We calculate terms in parentheses: -(-9+3(b-8)), so:

-9+3(b-8)

determiningTheFunctionDomain
3(b-8)-9

We multiply parentheses

3b-24-9

We add all the numbers together, and all the variables

3b-33

Back to the equation:

-(3b-33)



We get rid of parentheses

-3b+33+30=0

We add all the numbers together, and all the variables

-3b+63=0

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

-3b=-63

b=-63/-3

b=+21

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