9z-7z-z+4z=20

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Solution for 9z-7z-z+4z=20 equation: 



9z-7z-z+4z=20

We move all terms to the left:

9z-7z-z+4z-(20)=0

We add all the numbers together, and all the variables

5z-20=0

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

5z=20

z=20/5

z=4

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