z.z-12=30

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Solution for z.z-12=30 equation: 



z.z-12=30

We move all terms to the left:

z.z-12-(30)=0

We add all the numbers together, and all the variables

z.z-42=0

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

z.z=42

z=42/1

z=42

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