-z-9=2z+9

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Solution for -z-9=2z+9 equation: 



-z-9=2z+9

We move all terms to the left:

-z-9-(2z+9)=0

We add all the numbers together, and all the variables

-1z-(2z+9)-9=0

We get rid of parentheses

-1z-2z-9-9=0

We add all the numbers together, and all the variables

-3z-18=0

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

-3z=18

z=18/-3

z=-6

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