-84=-7(b+6)

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Solution for -84=-7(b+6) equation: 



-84=-7(b+6)

We move all terms to the left:

-84-(-7(b+6))=0



We calculate terms in parentheses: -(-7(b+6)), so:

-7(b+6)

We multiply parentheses

-7b-42

Back to the equation:

-(-7b-42)



We get rid of parentheses

7b+42-84=0

We add all the numbers together, and all the variables

7b-42=0

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

7b=42

b=42/7

b=6

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