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Subtract 70/9 from 42/21

1st number: 2 0/21, 2nd number: 7 7/9

42/21 - 70/9 is -52/9.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 21 and 9 is 63
  2. For the 1st fraction, since 21 × 3 = 63,
    42/21 = 42 × 3/21 × 3 = 126/63
  3. Likewise, for the 2nd fraction, since 9 × 7 = 63,
    70/9 = 70 × 7/9 × 7 = 490/63
  4. Subtract the two fractions:
    126/63 - 490/63 = 126 - 490/63 = -364/63
  5. After reducing the fraction, the answer is -52/9

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