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9z=3z-30
We move all terms to the left:
9z-(3z-30)=0
We get rid of parentheses
9z-3z+30=0
We add all the numbers together, and all the variables
6z+30=0
We move all terms containing z to the left, all other terms to the right
6z=-30
z=-30/6
z=-5
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