-91=-7(3b+1)

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Solution for -91=-7(3b+1) equation: 



-91=-7(3b+1)

We move all terms to the left:

-91-(-7(3b+1))=0



We calculate terms in parentheses: -(-7(3b+1)), so:

-7(3b+1)

We multiply parentheses

-21b-7

Back to the equation:

-(-21b-7)



We get rid of parentheses

21b+7-91=0

We add all the numbers together, and all the variables

21b-84=0

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

21b=84

b=84/21

b=4

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