-90=-6(1-7b)

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Solution for -90=-6(1-7b) equation: 



-90=-6(1-7b)

We move all terms to the left:

-90-(-6(1-7b))=0

We add all the numbers together, and all the variables

-(-6(-7b+1))-90=0



We calculate terms in parentheses: -(-6(-7b+1)), so:

-6(-7b+1)

We multiply parentheses

42b-6

Back to the equation:

-(42b-6)



We get rid of parentheses

-42b+6-90=0

We add all the numbers together, and all the variables

-42b-84=0

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

-42b=84

b=84/-42

b=-2

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