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9z-z=-1+4z-1-10
We move all terms to the left:
9z-z-(-1+4z-1-10)=0
We add all the numbers together, and all the variables
9z-z-(4z-12)=0
We add all the numbers together, and all the variables
8z-(4z-12)=0
We get rid of parentheses
8z-4z+12=0
We add all the numbers together, and all the variables
4z+12=0
We move all terms containing z to the left, all other terms to the right
4z=-12
z=-12/4
z=-3
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