7z-9=-9+7z

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



7z-9=-9+7z

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

7z-7z+9-9=0

We add all the numbers together, and all the variables

=0

z=0/1

z=0

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