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12z-(4z+6)=8
We move all terms to the left:
12z-(4z+6)-(8)=0
We get rid of parentheses
12z-4z-6-8=0
We add all the numbers together, and all the variables
8z-14=0
We move all terms containing z to the left, all other terms to the right
8z=14
z=14/8
z=1+3/4
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