2b(6b-1)+21=8b-b(3-12b)

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Solution for 2b(6b-1)+21=8b-b(3-12b) equation: 



2b(6b-1)+21=8b-b(3-12b)

We move all terms to the left:

2b(6b-1)+21-(8b-b(3-12b))=0

We add all the numbers together, and all the variables

2b(6b-1)-(8b-b(-12b+3))+21=0

We multiply parentheses

12b^2-2b-(8b-b(-12b+3))+21=0



We calculate terms in parentheses: -(8b-b(-12b+3)), so:

8b-b(-12b+3)

We multiply parentheses

12b^2+8b-3b

We add all the numbers together, and all the variables

12b^2+5b

Back to the equation:

-(12b^2+5b)



We get rid of parentheses

12b^2-12b^2-2b-5b+21=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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