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D( x )
x-6 = 0
x-6 = 0
x-6 = 0
x-6 = 0 // + 6
x = 6
x in (-oo:6) U (6:+oo)
(6*x-4)/(x-6) < 3 // - 3
(6*x-4)/(x-6)-3 < 0
(6*x-4)/(x-6)+(-3*(x-6))/(x-6) < 0
6*x-3*(x-6)-4 < 0
3*x+14 < 0
(3*x+14)/(x-6) < 0
(3*x+14)/(x-6) < 0 // * (x-6)^2
(3*x+14)*(x-6) < 0
( 3*x+14 )
3*x+14 < 0 // - 14
3*x < -14 // : 3
x < -14/3
( x-6 )
x-6 < 0 // + 6
x < 6
(-oo:-14/3) (-14/3:6) (6:+oo) 3*x+14 - + + x-6 - - +
x in (-14/3:6)
(-14/3:6)
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