Examples

    1.
      2/(x+3)+7/(2x-1) = [2(2x-1)+(x+3)7]/(x+3)(2x-1) = (11x+19)/(2x^2 +5x-3)

    2.

      (3x-1)/(x^2 +1) - 1/x = (2x^2 - x - 1)/(x^3 + x)

    3.

      A/(x-a) + B/(x-b) = [(A+B)x-Ab-Ba]/(x-a)(x-b)

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