-z-9=2z

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Solution for -z-9=2z equation: 



-z-9=2z

We move all terms to the left:

-z-9-(2z)=0

We add all the numbers together, and all the variables

-3z-9=0

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

-3z=9

z=9/-3

z=-3

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