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o/19=-9
We move all terms to the left:
o/19-(-9)=0
We add all the numbers together, and all the variables
o/19+9=0
We multiply all the terms by the denominator
o+9*19=0
We add all the numbers together, and all the variables
o+171=0
We move all terms containing o to the left, all other terms to the right
o=-171
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