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0.4z-0.8-0.6z=0.2
We move all terms to the left:
0.4z-0.8-0.6z-(0.2)=0
We add all the numbers together, and all the variables
-0.2z-1=0
We move all terms containing z to the left, all other terms to the right
-0.2z=1
z=1/-0.2
z=-5
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