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6.7=8.5z=-9z^4
We move all terms to the left:
6.7-(8.5z)=0
We add all the numbers together, and all the variables
-(+8.5z)+6.7=0
We get rid of parentheses
-8.5z+6.7=0
We move all terms containing z to the left, all other terms to the right
-8.5z=-6.7
z=-6.7/-8.5
z=2.4814814814815/3.1481481481481
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