-9=z+3

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Solution for -9=z+3 equation: 



-9=z+3

We move all terms to the left:

-9-(z+3)=0

We get rid of parentheses

-z-3-9=0

We add all the numbers together, and all the variables

-1z-12=0

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

-z=12

z=12/-1

z=-12

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