Question 88891
  1/x-1 - 1/x+1        = 3x/x^2-1 

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

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

  i.e,        2        = 3x

              x        = 2/3