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z+0.8+-9z=15.2
We move all terms to the left:
z+0.8+-9z-(15.2)=0
We add all the numbers together, and all the variables
-8z-14.4=0
We move all terms containing z to the left, all other terms to the right
-8z=14.4
z=14.4/-8
z=-1+2.6666666666667/3.3333333333333
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