-2(-2z)=20

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



-2(-2z)=20

We move all terms to the left:

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

We multiply parentheses

4z-20=0

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

4z=20

z=20/4

z=5

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