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.6O+0.5=0.8O-1.3
We move all terms to the left:
.6O+0.5-(0.8O-1.3)=0
We get rid of parentheses
.6O-0.8O+1.3+0.5=0
We add all the numbers together, and all the variables
-0.2O+1.8=0
We move all terms containing O to the left, all other terms to the right
-0.2O=-1.8
O=-1.8/-0.2
O=+9
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