84=-4(-7+2b)

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Solution for 84=-4(-7+2b) equation: 



84=-4(-7+2b)

We move all terms to the left:

84-(-4(-7+2b))=0

We add all the numbers together, and all the variables

-(-4(2b-7))+84=0



We calculate terms in parentheses: -(-4(2b-7)), so:

-4(2b-7)

We multiply parentheses

-8b+28

Back to the equation:

-(-8b+28)



We get rid of parentheses

8b-28+84=0

We add all the numbers together, and all the variables

8b+56=0

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

8b=-56

b=-56/8

b=-7

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