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.2O+1.4=0.9O-0.7
We move all terms to the left:
.2O+1.4-(0.9O-0.7)=0
We get rid of parentheses
.2O-0.9O+0.7+1.4=0
We add all the numbers together, and all the variables
-0.7O+2.1=0
We move all terms containing O to the left, all other terms to the right
-0.7O=-2.1
O=-2.1/-0.7
O=3+4.4408920985006E-16/0.7
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