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.4O+2=1.2O-6
We move all terms to the left:
.4O+2-(1.2O-6)=0
We get rid of parentheses
.4O-1.2O+6+2=0
We add all the numbers together, and all the variables
-0.8O+8=0
We move all terms containing O to the left, all other terms to the right
-0.8O=-8
O=-8/-0.8
O=+10
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