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8.1=0.9o
We move all terms to the left:
8.1-(0.9o)=0
We add all the numbers together, and all the variables
-(+0.9o)+8.1=0
We get rid of parentheses
-0.9o+8.1=0
We move all terms containing o to the left, all other terms to the right
-0.9o=-8.1
o=-8.1/-0.9
o=+9
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