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13z=9z-12
We move all terms to the left:
13z-(9z-12)=0
We get rid of parentheses
13z-9z+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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