9z-21=4z+19

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Solution for 9z-21=4z+19 equation: 



9z-21=4z+19

We move all terms to the left:

9z-21-(4z+19)=0

We get rid of parentheses

9z-4z-19-21=0

We add all the numbers together, and all the variables

5z-40=0

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

5z=40

z=40/5

z=8

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