9+9z=-9z-9

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Solution for 9+9z=-9z-9 equation: 



9+9z=-9z-9

We move all terms to the left:

9+9z-(-9z-9)=0

We get rid of parentheses

9z+9z+9+9=0

We add all the numbers together, and all the variables

18z+18=0

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

18z=-18

z=-18/18

z=-1

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