12=z-18

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Solution for 12=z-18 equation: 



12=z-18

We move all terms to the left:

12-(z-18)=0

We get rid of parentheses

-z+18+12=0

We add all the numbers together, and all the variables

-1z+30=0

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

-z=-30

z=-30/-1

z=+30

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