12=z-9

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Solution for 12=z-9 equation: 



12=z-9

We move all terms to the left:

12-(z-9)=0

We get rid of parentheses

-z+9+12=0

We add all the numbers together, and all the variables

-1z+21=0

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

-z=-21

z=-21/-1

z=+21

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