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Suppose the fraction is x. Then the upside down fraction is 1/x (x cannot be 0 since in that case the upside down fraction is not defined).The two fractions are the same.
Therefore x = 1/x.
Multiplying both sides by x gives x^2 = 1
And that only has the solutions x = 1 and x = -1.
So, not including ones leave the fraction -1 (or in ratio form, -1/1).
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