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Subtract 18/72 from 15/70

15/70 - 18/72 is -1/28.

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,
    15/70 = 15 × 36/70 × 36 = 540/2520
  3. Likewise, for the 2nd fraction, since 72 × 35 = 2520,
    18/72 = 18 × 35/72 × 35 = 630/2520
  4. Subtract the two fractions:
    540/2520 - 630/2520 = 540 - 630/2520 = -90/2520
  5. After reducing the fraction, the answer is -1/28

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