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Reduce the fraction to lowest terms by extracting and canceling out .
Least common multiple of and is . Convert and to fractions with denominator .
Since and have the same denominator, subtract them by subtracting their numerators.
Subtract from to get .

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\frac{1}{3}-\frac{9}{7}\approx -0.952380952
Reduce the fraction \frac{4}{12}\approx 0.333333333 to lowest terms by extracting and canceling out 4.
\frac{7}{21}-\frac{27}{21}\approx -0.952380952
Least common multiple of 3 and 7 is 21. Convert \frac{1}{3}\approx 0.333333333 and \frac{9}{7}\approx 1.285714286 to fractions with denominator 21.
\frac{7-27}{21}\approx -0.952380952
Since \frac{7}{21}\approx 0.333333333 and \frac{27}{21}\approx 1.285714286 have the same denominator, subtract them by subtracting their numerators.
-\frac{20}{21}\approx -0.952380952
Subtract 27 from 7 to get -20.
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