9+3z=30

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Solution for 9+3z=30 equation: 



9+3z=30

We move all terms to the left:

9+3z-(30)=0

We add all the numbers together, and all the variables

3z-21=0

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

3z=21

z=21/3

z=7

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