18=9z-8z

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Solution for 18=9z-8z equation: 



18=9z-8z

We move all terms to the left:

18-(9z-8z)=0

We add all the numbers together, and all the variables

-(+z)+18=0

We get rid of parentheses

-z+18=0

We add all the numbers together, and all the variables

-1z+18=0

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

-z=-18

z=-18/-1

z=+18

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