9z-3z=15

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Solution for 9z-3z=15 equation: 



9z-3z=15

We move all terms to the left:

9z-3z-(15)=0

We add all the numbers together, and all the variables

6z-15=0

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

6z=15

z=15/6

z=2+1/2

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