8z=z+21

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Solution for 8z=z+21 equation: 



8z=z+21

We move all terms to the left:

8z-(z+21)=0

We get rid of parentheses

8z-z-21=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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