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\frac{1}{20}-\frac{2}{20}
Least common multiple of 20 and 10 is 20. Convert \frac{1}{20} and \frac{1}{10} to fractions with denominator 20.
\frac{1-2}{20}
Since \frac{1}{20} and \frac{2}{20} have the same denominator, subtract them by subtracting their numerators.
-\frac{1}{20}
Subtract 2 from 1 to get -1.