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Subtract 28/20 from 15/70

1st number: 15/70, 2nd number: 1 8/20

15/70 - 28/20 is -83/70.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 20 is 140
  2. For the 1st fraction, since 70 × 2 = 140,
    15/70 = 15 × 2/70 × 2 = 30/140
  3. Likewise, for the 2nd fraction, since 20 × 7 = 140,
    28/20 = 28 × 7/20 × 7 = 196/140
  4. Subtract the two fractions:
    30/140 - 196/140 = 30 - 196/140 = -166/140
  5. After reducing the fraction, the answer is -83/70

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