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D( x )
x-5 = 0
x-5 = 0
x-5 = 0
x-5 = 0 // + 5
x = 5
x in (-oo:5) U (5:+oo)
(x-1)/(x-5) < 0
( x-1 )
x-1 < 0 // + 1
x < 1
( x-5 )
x-5 < 0 // + 5
x < 5
(-oo:1) (1:5) (5:+oo) x-1 - + + x-5 - - +
x in (1:5)
(1:5)
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