84=-3(-8b-4)

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Solution for 84=-3(-8b-4) equation: 



84=-3(-8b-4)

We move all terms to the left:

84-(-3(-8b-4))=0



We calculate terms in parentheses: -(-3(-8b-4)), so:

-3(-8b-4)

We multiply parentheses

24b+12

Back to the equation:

-(24b+12)



We get rid of parentheses

-24b-12+84=0

We add all the numbers together, and all the variables

-24b+72=0

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

-24b=-72

b=-72/-24

b=+3

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