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Subtract 21/7 from 2/5

1st number: 2/5, 2nd number: 3 0/7

2/5 - 21/7 is -13/5.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 5 and 7 is 35
  2. For the 1st fraction, since 5 × 7 = 35,
    2/5 = 2 × 7/5 × 7 = 14/35
  3. Likewise, for the 2nd fraction, since 7 × 5 = 35,
    21/7 = 21 × 5/7 × 5 = 105/35
  4. Subtract the two fractions:
    14/35 - 105/35 = 14 - 105/35 = -91/35
  5. After reducing the fraction, the answer is -13/5

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