4z-21=21

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Solution for 4z-21=21 equation: 



4z-21=21

We move all terms to the left:

4z-21-(21)=0

We add all the numbers together, and all the variables

4z-42=0

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

4z=42

z=42/4

z=10+1/2

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