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