-21+5b=5-4(4b-4)

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Solution for -21+5b=5-4(4b-4) equation: 



-21+5b=5-4(4b-4)

We move all terms to the left:

-21+5b-(5-4(4b-4))=0



We calculate terms in parentheses: -(5-4(4b-4)), so:

5-4(4b-4)

determiningTheFunctionDomain
-4(4b-4)+5

We multiply parentheses

-16b+16+5

We add all the numbers together, and all the variables

-16b+21

Back to the equation:

-(-16b+21)



We get rid of parentheses

5b+16b-21-21=0

We add all the numbers together, and all the variables

21b-42=0

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

21b=42

b=42/21

b=2

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