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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)
5/(x-6) > 4 // - 4
5/(x-6)-4 > 0
5/(x-6)+(-4*(x-6))/(x-6) > 0
5-4*(x-6) > 0
29-4*x > 0
(29-4*x)/(x-6) > 0
(29-4*x)/(x-6) > 0 // * (x-6)^2
(29-4*x)*(x-6) > 0
( 29-4*x )
29-4*x > 0 // - 29
-4*x > -29 // : -4
x < -29/(-4)
x < 29/4
( x-6 )
x-6 > 0 // + 6
x > 6
(-oo:6) (6:29/4) (29/4:+oo) 29-4*x + + - x-6 - + +
x in (6:29/4)
(6:29/4)
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