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12z-8=8z+20
We move all terms to the left:
12z-8-(8z+20)=0
We get rid of parentheses
12z-8z-20-8=0
We add all the numbers together, and all the variables
4z-28=0
We move all terms containing z to the left, all other terms to the right
4z=28
z=28/4
z=7
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