-217=-7b-7(3-8b)

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Solution for -217=-7b-7(3-8b) equation: 



-217=-7b-7(3-8b)

We move all terms to the left:

-217-(-7b-7(3-8b))=0

We add all the numbers together, and all the variables

-(-7b-7(-8b+3))-217=0



We calculate terms in parentheses: -(-7b-7(-8b+3)), so:

-7b-7(-8b+3)

We multiply parentheses

-7b+56b-21

We add all the numbers together, and all the variables

49b-21

Back to the equation:

-(49b-21)



We get rid of parentheses

-49b+21-217=0

We add all the numbers together, and all the variables

-49b-196=0

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

-49b=196

b=196/-49

b=-4

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