-7=9+8z

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Solution for -7=9+8z equation: 



-7=9+8z

We move all terms to the left:

-7-(9+8z)=0

We add all the numbers together, and all the variables

-(8z+9)-7=0

We get rid of parentheses

-8z-9-7=0

We add all the numbers together, and all the variables

-8z-16=0

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

-8z=16

z=16/-8

z=-2

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