-7b-21=-8(3b-8)

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Solution for -7b-21=-8(3b-8) equation: 



-7b-21=-8(3b-8)

We move all terms to the left:

-7b-21-(-8(3b-8))=0



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

-8(3b-8)

We multiply parentheses

-24b+64

Back to the equation:

-(-24b+64)



We get rid of parentheses

-7b+24b-64-21=0

We add all the numbers together, and all the variables

17b-85=0

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

17b=85

b=85/17

b=5

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