9z-81=90

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Solution for 9z-81=90 equation: 



9z-81=90

We move all terms to the left:

9z-81-(90)=0

We add all the numbers together, and all the variables

9z-171=0

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

9z=171

z=171/9

z=19

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