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D( x )
x-500 = 0
x-500 = 0
x-500 = 0
x-500 = 0 // + 500
x = 500
x in (-oo:500) U (500:+oo)
1.5 = x/(x-500) // - x/(x-500)
1.5-(x/(x-500)) = 0
(-1*x)/(x-500)+1.5 = 0
(-1*x)/(x-500)+(1.5*(x-500))/(x-500) = 0
1.5*(x-500)-1*x = 0
0.5*x-750 = 0
(0.5*x-750)/(x-500) = 0
(0.5*x-750)/(x-500) = 0 // * x-500
0.5*x-750 = 0
0.5*x-750 = 0 // + 750
0.5*x = 750 // : 0.5
x = 750/0.5
x = 1500
x = 1500
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