9+6z=21

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Solution for 9+6z=21 equation: 



9+6z=21

We move all terms to the left:

9+6z-(21)=0

We add all the numbers together, and all the variables

6z-12=0

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

6z=12

z=12/6

z=2

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