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\frac{19}{21}-\frac{15}{21}
Least common multiple of 21 and 7 is 21. Convert \frac{19}{21} and \frac{5}{7} to fractions with denominator 21.
\frac{19-15}{21}
Since \frac{19}{21} and \frac{15}{21} have the same denominator, subtract them by subtracting their numerators.
\frac{4}{21}
Subtract 15 from 19 to get 4.