-7z-9+4z=31

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Solution for -7z-9+4z=31 equation: 



-7z-9+4z=31

We move all terms to the left:

-7z-9+4z-(31)=0

We add all the numbers together, and all the variables

-3z-40=0

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

-3z=40

z=40/-3

z=-13+1/3

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