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1.8=o.9
We move all terms to the left:
1.8-(o.9)=0
We add all the numbers together, and all the variables
-(+o.9)+1.8=0
We get rid of parentheses
-o.9+1.8=0
We move all terms containing o to the left, all other terms to the right
-o.9=-1.8
o=-1.8/1
o=-1.8
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