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.5(O+2.75)=3
We move all terms to the left:
.5(O+2.75)-(3)=0
We multiply parentheses
0.5O+1.375-3=0
We add all the numbers together, and all the variables
0.5O-1.625=0
We move all terms containing O to the left, all other terms to the right
0.5O=1.625
O=1.625/0.5
O=3+0.125/0.5
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