4z-9z=30

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Solution for 4z-9z=30 equation: 



4z-9z=30

We move all terms to the left:

4z-9z-(30)=0

We add all the numbers together, and all the variables

-5z-30=0

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

-5z=30

z=30/-5

z=-6

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