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\frac{1}{3}-\frac{9}{7}
Reduce the fraction \frac{4}{12} to lowest terms by extracting and canceling out 4.
\frac{7}{21}-\frac{27}{21}
Least common multiple of 3 and 7 is 21. Convert \frac{1}{3} and \frac{9}{7} to fractions with denominator 21.
\frac{7-27}{21}
Since \frac{7}{21} and \frac{27}{21} have the same denominator, subtract them by subtracting their numerators.
-\frac{20}{21}
Subtract 27 from 7 to get -20.