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.2O+10.5=15
We move all terms to the left:
.2O+10.5-(15)=0
We add all the numbers together, and all the variables
.2O-4.5=0
We move all terms containing O to the left, all other terms to the right
.2O=4.5
O=4.5/.2
O=22+0.1/.2
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