-21=-20-2(2x-0.5)

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Solution for -21=-20-2(2x-0.5) equation: 



-21=-20-2(2x-0.5)

We move all terms to the left:

-21-(-20-2(2x-0.5))=0



We calculate terms in parentheses: -(-20-2(2x-0.5)), so:

-20-2(2x-0.5)

determiningTheFunctionDomain
-2(2x-0.5)-20

We multiply parentheses

-4x+1-20

We add all the numbers together, and all the variables

-4x-19

Back to the equation:

-(-4x-19)



We get rid of parentheses

4x+19-21=0

We add all the numbers together, and all the variables

4x-2=0

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

4x=2

x=2/4

x=1/2

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