-9z-9=-8z-7

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Solution for -9z-9=-8z-7 equation: 



-9z-9=-8z-7

We move all terms to the left:

-9z-9-(-8z-7)=0

We get rid of parentheses

-9z+8z+7-9=0

We add all the numbers together, and all the variables

-1z-2=0

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

-z=2

z=2/-1

z=-2

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