-309=-3b-9(1+3b)

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Solution for -309=-3b-9(1+3b) equation: 



-309=-3b-9(1+3b)

We move all terms to the left:

-309-(-3b-9(1+3b))=0

We add all the numbers together, and all the variables

-(-3b-9(3b+1))-309=0



We calculate terms in parentheses: -(-3b-9(3b+1)), so:

-3b-9(3b+1)

We multiply parentheses

-3b-27b-9

We add all the numbers together, and all the variables

-30b-9

Back to the equation:

-(-30b-9)



We get rid of parentheses

30b+9-309=0

We add all the numbers together, and all the variables

30b-300=0

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

30b=300

b=300/30

b=10

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