(-z-9)=0

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Solution for (-z-9)=0 equation: 



(-z-9)=0

We add all the numbers together, and all the variables

(-1z-9)=0

We get rid of parentheses

-1z-9=0

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

-z=9

z=9/-1

z=-9

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