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81=2O-385
We move all terms to the left:
81-(2O-385)=0
We get rid of parentheses
-2O+385+81=0
We add all the numbers together, and all the variables
-2O+466=0
We move all terms containing O to the left, all other terms to the right
-2O=-466
O=-466/-2
O=+233
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