9+z=-9-z

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



9+z=-9-z

We move all terms to the left:

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

We add all the numbers together, and all the variables

z-(-1z-9)+9=0

We get rid of parentheses

z+1z+9+9=0

We add all the numbers together, and all the variables

2z+18=0

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

2z=-18

z=-18/2

z=-9

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