-3z=+15

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Solution for -3z=+15 equation: 



-3z=+15

We move all terms to the left:

-3z-(+15)=0

We add all the numbers together, and all the variables

-3z-15=0

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

-3z=15

z=15/-3

z=-5

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