21+6b=-3(1-3b)

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Solution for 21+6b=-3(1-3b) equation: 



21+6b=-3(1-3b)

We move all terms to the left:

21+6b-(-3(1-3b))=0

We add all the numbers together, and all the variables

6b-(-3(-3b+1))+21=0



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

-3(-3b+1)

We multiply parentheses

9b-3

Back to the equation:

-(9b-3)



We get rid of parentheses

6b-9b+3+21=0

We add all the numbers together, and all the variables

-3b+24=0

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

-3b=-24

b=-24/-3

b=+8

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