7z-90=z

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Solution for 7z-90=z equation: 



7z-90=z

We move all terms to the left:

7z-90-(z)=0

We add all the numbers together, and all the variables

6z-90=0

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

6z=90

z=90/6

z=15

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