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Subtract 28/72 from 8/70

8/70 - 28/72 is -173/630.

Steps for subtracting fractions

  1. Find the least common denominator or LCM of the two denominators:
    LCM of 70 and 72 is 2520
  2. For the 1st fraction, since 70 × 36 = 2520,
    8/70 = 8 × 36/70 × 36 = 288/2520
  3. Likewise, for the 2nd fraction, since 72 × 35 = 2520,
    28/72 = 28 × 35/72 × 35 = 980/2520
  4. Subtract the two fractions:
    288/2520 - 980/2520 = 288 - 980/2520 = -692/2520
  5. After reducing the fraction, the answer is -173/630

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