20=-2(-2-2z)

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Solution for 20=-2(-2-2z) equation: 



20=-2(-2-2z)

We move all terms to the left:

20-(-2(-2-2z))=0

We add all the numbers together, and all the variables

-(-2(-2z-2))+20=0



We calculate terms in parentheses: -(-2(-2z-2)), so:

-2(-2z-2)

We multiply parentheses

4z+4

Back to the equation:

-(4z+4)



We get rid of parentheses

-4z-4+20=0

We add all the numbers together, and all the variables

-4z+16=0

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

-4z=-16

z=-16/-4

z=+4

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