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D( x )
x = 0
x-3 = 0
x = 0
x = 0
x-3 = 0
x-3 = 0
x-3 = 0 // + 3
x = 3
x in (-oo:0) U (0:3) U (3:+oo)
-8/x = -16/(x-3) // + -16/(x-3)
-(-16/(x-3))-8/x = 0
16*(x-3)^-1-8/x = 0
16/(x-3)-8/x = 0
(16*x)/(x*(x-3))+(-8*(x-3))/(x*(x-3)) = 0
16*x-8*(x-3) = 0
8*x+24 = 0
(8*x+24)/(x*(x-3)) = 0
(8*x+24)/(x*(x-3)) = 0 // * x*(x-3)
8*x+24 = 0
8*x+24 = 0 // - 24
8*x = -24 // : 8
x = -24/8
x = -3
x = -3
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