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.5O-3.5=0.2O-0.5
We move all terms to the left:
.5O-3.5-(0.2O-0.5)=0
We get rid of parentheses
.5O-0.2O+0.5-3.5=0
We add all the numbers together, and all the variables
0.3O-3=0
We move all terms containing O to the left, all other terms to the right
0.3O=3
O=3/0.3
O=10
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