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D( x )
x-3 = 0
x-8 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x-8 = 0
x-8 = 0
x-8 = 0 // + 8
x = 8
x in (-oo:3) U (3:8) U (8:+oo)
(x-4)/(x-3) = (x-5)/(x-8) // - (x-5)/(x-8)
(x-4)/(x-3)-((x-5)/(x-8)) = 0
(x-4)/(x-3)+(-1*(x-5))/(x-8) = 0
((x-4)*(x-8))/((x-3)*(x-8))+(-1*(x-5)*(x-3))/((x-3)*(x-8)) = 0
(x-4)*(x-8)-1*(x-5)*(x-3) = 0
17-4*x = 0
(17-4*x)/((x-3)*(x-8)) = 0
(17-4*x)/((x-3)*(x-8)) = 0 // * (x-3)*(x-8)
17-4*x = 0
17-4*x = 0 // - 17
-4*x = -17 // : -4
x = -17/(-4)
x = 17/4
x = 17/4
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