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D( x )
x-1 = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:+oo)
(x-5)/(x-1) >= 3 // - 3
(x-5)/(x-1)-3 >= 0
(x-5)/(x-1)+(-3*(x-1))/(x-1) >= 0
x-3*(x-1)-5 >= 0
-2*x-2 >= 0
(-2*x-2)/(x-1) >= 0
(-2*x-2)/(x-1) >= 0 // * (x-1)^2
(-2*x-2)*(x-1) >= 0
( -2*x-2 )
-2*x-2 >= 0 // + 2
-2*x >= 2 // : -2
x <= 2/(-2)
x <= -1
( x-1 )
x-1 >= 0 // + 1
x >= 1
(-oo:-1) (-1:1) (1:+oo) -2*x-2 + - - x-1 - - +
x in <-1:1)
<-1:1)
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