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-20=-6Z+15
We move all terms to the left:
-20-(-6Z+15)=0
We get rid of parentheses
6Z-15-20=0
We add all the numbers together, and all the variables
6Z-35=0
We move all terms containing Z to the left, all other terms to the right
6Z=35
Z=35/6
Z=5+5/6
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