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.18(O-1)+0.10=0.20O-0.5
We move all terms to the left:
.18(O-1)+0.10-(0.20O-0.5)=0
We add all the numbers together, and all the variables
.18(O-1)-(0.20O-0.5)+0.1=0
We multiply parentheses
0.18O-(0.20O-0.5)-0.18+0.1=0
We get rid of parentheses
0.18O-0.20O+0.5-0.18+0.1=0
We add all the numbers together, and all the variables
-0.02O+0.42=0
We move all terms containing O to the left, all other terms to the right
-0.02O=-0.42
O=-0.42/-0.02
O=+21
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