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D( x )
x-9 = 0
x-9 = 0
x-9 = 0
x-9 = 0 // + 9
x = 9
x in (-oo:9) U (9:+oo)
-9/(x-9) = 9 // - 9
-9/(x-9)-9 = 0
(-9*(x-9))/(x-9)-9/(x-9) = 0
-9*(x-9)-9 = 0
72-9*x = 0
(72-9*x)/(x-9) = 0
(72-9*x)/(x-9) = 0 // * x-9
72-9*x = 0
72-9*x = 0 // - 72
-9*x = -72 // : -9
x = -72/(-9)
x = 8
x = 8
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