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100z-20=5z-8
We move all terms to the left:
100z-20-(5z-8)=0
We get rid of parentheses
100z-5z+8-20=0
We add all the numbers together, and all the variables
95z-12=0
We move all terms containing z to the left, all other terms to the right
95z=12
z=12/95
z=12/95
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