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.5O-0.25=4
We move all terms to the left:
.5O-0.25-(4)=0
We add all the numbers together, and all the variables
.5O-4.25=0
We move all terms containing O to the left, all other terms to the right
.5O=4.25
O=4.25/.5
O=8+0.25/.5
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