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Subtract 80/49 from 20/42

1st number: 20/42, 2nd number: 1 31/49

20/42 - 80/49 is -170/147.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 42 and 49 is 294

    Next, find the equivalent fraction of both fractional numbers with denominator 294
  2. For the 1st fraction, since 42 × 7 = 294,
    20/42 = 20 × 7/42 × 7 = 140/294
  3. Likewise, for the 2nd fraction, since 49 × 6 = 294,
    80/49 = 80 × 6/49 × 6 = 480/294
  4. Subtract the two like fractions:
    140/294 - 480/294 = 140 - 480/294 = -340/294
  5. After reducing the fraction, the answer is -170/147

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