3z-21=10z

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Solution for 3z-21=10z equation: 



3z-21=10z

We move all terms to the left:

3z-21-(10z)=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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