-21-z=30

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Solution for -21-z=30 equation: 



-21-z=30

We move all terms to the left:

-21-z-(30)=0

We add all the numbers together, and all the variables

-1z-51=0

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

-z=51

z=51/-1

z=-51

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