4z-20=64

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Solution for 4z-20=64 equation: 



4z-20=64

We move all terms to the left:

4z-20-(64)=0

We add all the numbers together, and all the variables

4z-84=0

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

4z=84

z=84/4

z=21

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