9(z-81)=81

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Solution for 9(z-81)=81 equation: 



9(z-81)=81

We move all terms to the left:

9(z-81)-(81)=0

We multiply parentheses

9z-729-81=0

We add all the numbers together, and all the variables

9z-810=0

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

9z=810

z=810/9

z=90

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