-87=-3(6b-7)

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Solution for -87=-3(6b-7) equation: 



-87=-3(6b-7)

We move all terms to the left:

-87-(-3(6b-7))=0



We calculate terms in parentheses: -(-3(6b-7)), so:

-3(6b-7)

We multiply parentheses

-18b+21

Back to the equation:

-(-18b+21)



We get rid of parentheses

18b-21-87=0

We add all the numbers together, and all the variables

18b-108=0

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

18b=108

b=108/18

b=6

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