4z-z=21-9

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



4z-z=21-9

We move all terms to the left:

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

We add all the numbers together, and all the variables

4z-z-12=0

We add all the numbers together, and all the variables

3z-12=0

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

3z=12

z=12/3

z=4

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