By fractional distillation.
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All fractions are proportional to some other fraction.
The two fractions are -181/2 and 191/2.
Take one of the fractions. Multiply its numerator and denominator by any integer greater than 1. The result will be a fraction with is equivalent to the fraction that you started with but no longer similar to the other fraction.
Choose ANY fraction. Multiply 5/6 by that fraction to get the other fraction.
Improper fractions and proper fractions are mutually exclusive; one can't be the other.