7z+-13z+-21=9

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Solution for 7z+-13z+-21=9 equation: 



7z+-13z+-21=9

We move all terms to the left:

7z+-13z+-21-(9)=0

determiningTheFunctionDomain
7z-13z-21-9++=0

We add all the numbers together, and all the variables

-6z=0

z=0/-6

z=0

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