-21=0.7z=z

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Solution for -21=0.7z=z equation: 



-21=0.7z=z

We move all terms to the left:

-21-(0.7z)=0

We add all the numbers together, and all the variables

-(+0.7z)-21=0

We get rid of parentheses

-0.7z-21=0

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

-0.7z=21

z=21/-0.7

z=-30

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