0=7z-9z

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Solution for 0=7z-9z equation: 



0=7z-9z

We move all terms to the left:

0-(7z-9z)=0

We add all the numbers together, and all the variables

-(-2z)+0=0

We add all the numbers together, and all the variables

-(-2z)=0

We get rid of parentheses

2z=0

z=0/2

z=0

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