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5z=8z-12
We move all terms to the left:
5z-(8z-12)=0
We get rid of parentheses
5z-8z+12=0
We add all the numbers together, and all the variables
-3z+12=0
We move all terms containing z to the left, all other terms to the right
-3z=-12
z=-12/-3
z=+4
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