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20z-5-12=10z+8=
We move all terms to the left:
20z-5-12-(10z+8)=0
We add all the numbers together, and all the variables
20z-(10z+8)-17=0
We get rid of parentheses
20z-10z-8-17=0
We add all the numbers together, and all the variables
10z-25=0
We move all terms containing z to the left, all other terms to the right
10z=25
z=25/10
z=2+1/2
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