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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)
x/(x-9) < 0
( x-9 )
x-9 < 0 // + 9
x < 9
( x )
x+0 < 0 // - 0
x < 0
(-oo:0) (0:9) (9:+oo) x-9 - - + x - + +
x in (0:9)
(0:9)
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