Preference

Question: 2/(a - b) - 5/(b - a) =?

  1. a.
    -10/(2ab -a - b)
  2. b.
    -3/(a - b)
  3. c.
    -7/(a - b)
  4. d.
    -7/(b - a)
  5. e.
    -3/(b - a)
Answer: d
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