21=9-2(2x-8)

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Solution for 21=9-2(2x-8) equation: 



21=9-2(2x-8)

We move all terms to the left:

21-(9-2(2x-8))=0



We calculate terms in parentheses: -(9-2(2x-8)), so:

9-2(2x-8)

determiningTheFunctionDomain
-2(2x-8)+9

We multiply parentheses

-4x+16+9

We add all the numbers together, and all the variables

-4x+25

Back to the equation:

-(-4x+25)



We get rid of parentheses

4x-25+21=0

We add all the numbers together, and all the variables

4x-4=0

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

4x=4

x=4/4

x=1

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