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Subtract 7/5 from 7/21

1st number: 7/21, 2nd number: 1 2/5

7/21 - 7/5 is -16/15.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 5 is 105
  2. For the 1st fraction, since 21 × 5 = 105,
    7/21 = 7 × 5/21 × 5 = 35/105
  3. Likewise, for the 2nd fraction, since 5 × 21 = 105,
    7/5 = 7 × 21/5 × 21 = 147/105
  4. Subtract the two fractions:
    35/105 - 147/105 = 35 - 147/105 = -112/105
  5. After reducing the fraction, the answer is -16/15

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