9=7z-12

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Solution for 9=7z-12 equation: 



9=7z-12

We move all terms to the left:

9-(7z-12)=0

We get rid of parentheses

-7z+12+9=0

We add all the numbers together, and all the variables

-7z+21=0

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

-7z=-21

z=-21/-7

z=+3

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