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6z=2z+12
We move all terms to the left:
6z-(2z+12)=0
We get rid of parentheses
6z-2z-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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