31-4z=15

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Solution for 31-4z=15 equation: 



31-4z=15

We move all terms to the left:

31-4z-(15)=0

We add all the numbers together, and all the variables

-4z+16=0

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

-4z=-16

z=-16/-4

z=+4

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