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D( x )
x-3 = 0
x+6 = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x+6 = 0
x+6 = 0
x+6 = 0 // - 6
x = -6
x in (-oo:-6) U (-6:3) U (3:+oo)
(x-4)/(x+6) = (x-8)/(x-3) // - (x-8)/(x-3)
(x-4)/(x+6)-((x-8)/(x-3)) = 0
(x-4)/(x+6)+(-1*(x-8))/(x-3) = 0
((x-4)*(x-3))/((x+6)*(x-3))+(-1*(x-8)*(x+6))/((x+6)*(x-3)) = 0
(x-4)*(x-3)-1*(x-8)*(x+6) = 0
60-5*x = 0
(60-5*x)/((x+6)*(x-3)) = 0
(60-5*x)/((x+6)*(x-3)) = 0 // * (x+6)*(x-3)
60-5*x = 0
60-5*x = 0 // - 60
-5*x = -60 // : -5
x = -60/(-5)
x = 12
x = 12
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