9-7z-13z=21

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Solution for 9-7z-13z=21 equation: 



9-7z-13z=21

We move all terms to the left:

9-7z-13z-(21)=0

We add all the numbers together, and all the variables

-20z-12=0

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

-20z=12

z=12/-20

z=-3/5

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