-8b-21=7-4(b+1)

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Solution for -8b-21=7-4(b+1) equation: 



-8b-21=7-4(b+1)

We move all terms to the left:

-8b-21-(7-4(b+1))=0



We calculate terms in parentheses: -(7-4(b+1)), so:

7-4(b+1)

determiningTheFunctionDomain
-4(b+1)+7

We multiply parentheses

-4b-4+7

We add all the numbers together, and all the variables

-4b+3

Back to the equation:

-(-4b+3)



We get rid of parentheses

-8b+4b-3-21=0

We add all the numbers together, and all the variables

-4b-24=0

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

-4b=24

b=24/-4

b=-6

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