-18=z+3

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Solution for -18=z+3 equation: 



-18=z+3

We move all terms to the left:

-18-(z+3)=0

We get rid of parentheses

-z-3-18=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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