7z-4z=21

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Solution for 7z-4z=21 equation: 



7z-4z=21

We move all terms to the left:

7z-4z-(21)=0

We add all the numbers together, and all the variables

3z-21=0

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

3z=21

z=21/3

z=7

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