21=4+4(q-8)

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Solution for 21=4+4(q-8) equation: 



21=4+4(q-8)

We move all terms to the left:

21-(4+4(q-8))=0



We calculate terms in parentheses: -(4+4(q-8)), so:

4+4(q-8)

determiningTheFunctionDomain
4(q-8)+4

We multiply parentheses

4q-32+4

We add all the numbers together, and all the variables

4q-28

Back to the equation:

-(4q-28)



We get rid of parentheses

-4q+28+21=0

We add all the numbers together, and all the variables

-4q+49=0

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

-4q=-49

q=-49/-4

q=12+1/4

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