-84=-7(4-b)

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



-84=-7(4-b)

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(-7(-1b+4))-84=0



We calculate terms in parentheses: -(-7(-1b+4)), so:

-7(-1b+4)

We multiply parentheses

7b-28

Back to the equation:

-(7b-28)



We get rid of parentheses

-7b+28-84=0

We add all the numbers together, and all the variables

-7b-56=0

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

-7b=56

b=56/-7

b=-8

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