12z-9z=15

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Solution for 12z-9z=15 equation: 



12z-9z=15

We move all terms to the left:

12z-9z-(15)=0

We add all the numbers together, and all the variables

3z-15=0

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

3z=15

z=15/3

z=5

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