81=-3(1+4b)

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Solution for 81=-3(1+4b) equation: 



81=-3(1+4b)

We move all terms to the left:

81-(-3(1+4b))=0

We add all the numbers together, and all the variables

-(-3(4b+1))+81=0



We calculate terms in parentheses: -(-3(4b+1)), so:

-3(4b+1)

We multiply parentheses

-12b-3

Back to the equation:

-(-12b-3)



We get rid of parentheses

12b+3+81=0

We add all the numbers together, and all the variables

12b+84=0

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

12b=-84

b=-84/12

b=-7

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