99=9+9z

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Solution for 99=9+9z equation: 



99=9+9z

We move all terms to the left:

99-(9+9z)=0

We add all the numbers together, and all the variables

-(9z+9)+99=0

We get rid of parentheses

-9z-9+99=0

We add all the numbers together, and all the variables

-9z+90=0

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

-9z=-90

z=-90/-9

z=+10

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