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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)
6/(x-9) < 12 // - 12
6/(x-9)-12 < 0
6/(x-9)+(-12*(x-9))/(x-9) < 0
6-12*(x-9) < 0
114-12*x < 0
(114-12*x)/(x-9) < 0
(114-12*x)/(x-9) < 0 // * (x-9)^2
(114-12*x)*(x-9) < 0
( 114-12*x )
114-12*x < 0 // - 114
-12*x < -114 // : -12
x > -114/(-12)
x > 19/2
( x-9 )
x-9 < 0 // + 9
x < 9
(-oo:9) (9:19/2) (19/2:+oo) 114-12*x + + - x-9 - + +
x in (-oo:9) U (19/2:+oo)
(-oo:9) U (19/2:+oo)
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