9z-9=99

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Solution for 9z-9=99 equation: 



9z-9=99

We move all terms to the left:

9z-9-(99)=0

We add all the numbers together, and all the variables

9z-108=0

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

9z=108

z=108/9

z=12

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