Question 388018
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Hi,         
solving
720/x + 720/x-4 = 2  Multiplying each term by x(x-4) so as all denominators = 1
 720(x-4) + 720x = 2x(x-4)
 720x - 4*720 = 2x^2 - 8x
 2x^2 -728x + 4*720 = 0
  x^2 - 364x + 1440 = 0
factoring (or using Quadratic Equation to solve for x)
(x -4)(x-360) = 0 Note:SUM of the inner product(-4x) and the outer product(-36x) = -364x
 (x -4)=0
     x = 4
(x-360) = 0
     x = 360
OR
{{{x = (364 +- sqrt( 126736))/(2) }}}
{{{x = (364 +- 356)/(2) }}}
   x = 8/2 = 4
   x = 720/2 = 360