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.8+2O=O+3.5
We move all terms to the left:
.8+2O-(O+3.5)=0
We add all the numbers together, and all the variables
2O-(O+3.5)+0.8=0
We get rid of parentheses
2O-O-3.5+0.8=0
We add all the numbers together, and all the variables
O-2.7=0
We move all terms containing O to the left, all other terms to the right
O=2.7
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