9(z-1)=90

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Solution for 9(z-1)=90 equation: 



9(z-1)=90

We move all terms to the left:

9(z-1)-(90)=0

We multiply parentheses

9z-9-90=0

We add all the numbers together, and all the variables

9z-99=0

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

9z=99

z=99/9

z=11

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