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Subtract 8/21 from 1/5

1/5 - 8/21 is -19/105.

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,
    1/5 = 1 × 21/5 × 21 = 21/105
  3. Likewise, for the 2nd fraction, since 21 × 5 = 105,
    8/21 = 8 × 5/21 × 5 = 40/105
  4. Subtract the two fractions:
    21/105 - 40/105 = 21 - 40/105 = -19/105

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