9z-90=9z-90

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Solution for 9z-90=9z-90 equation: 



9z-90=9z-90

We move all terms to the left:

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

We get rid of parentheses

9z-9z+90-90=0

We add all the numbers together, and all the variables

=0

z=0/1

z=0

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