7z-z-3z+3z=18

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Solution for 7z-z-3z+3z=18 equation: 



7z-z-3z+3z=18

We move all terms to the left:

7z-z-3z+3z-(18)=0

We add all the numbers together, and all the variables

6z-18=0

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

6z=18

z=18/6

z=3

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