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Subtract 3/21 from 2/5

2/5 - 3/21 is 9/35.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 5 and 21 is 105
  2. For the 1st fraction, since 5 × 21 = 105,
    2/5 = 2 × 21/5 × 21 = 42/105
  3. Likewise, for the 2nd fraction, since 21 × 5 = 105,
    3/21 = 3 × 5/21 × 5 = 15/105
  4. Subtract the two fractions:
    42/105 - 15/105 = 42 - 15/105 = 27/105
  5. After reducing the fraction, the answer is 9/35

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