7z-8=13

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Solution for 7z-8=13 equation: 



7z-8=13

We move all terms to the left:

7z-8-(13)=0

We add all the numbers together, and all the variables

7z-21=0

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

7z=21

z=21/7

z=3

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