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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)
(6*x)/(x-1) < 3 // - 3
(6*x)/(x-1)-3 < 0
(6*x)/(x-1)+(-3*(x-1))/(x-1) < 0
6*x-3*(x-1) < 0
3*x+3 < 0
(3*x+3)/(x-1) < 0
(3*x+3)/(x-1) < 0 // * (x-1)^2
(3*x+3)*(x-1) < 0
( 3*x+3 )
3*x+3 < 0 // - 3
3*x < -3 // : 3
x < -3/3
x < -1
( x-1 )
x-1 < 0 // + 1
x < 1
(-oo:-1) (-1:1) (1:+oo) 3*x+3 - + + x-1 - - +
x in (-1:1)
(-1:1)
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