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D( x )
10*x-11 = 0
10*x-11 = 0
10*x-11 = 0
10*x-11 = 0 // + 11
10*x = 11 // : 10
x = 11/10
x in (-oo:11/10) U (11/10:+oo)
(39*x-25)/(10*x-11) >= 3 // - 3
(39*x-25)/(10*x-11)-3 >= 0
(39*x-25)/(10*x-11)+(-3*(10*x-11))/(10*x-11) >= 0
39*x-3*(10*x-11)-25 >= 0
9*x+8 >= 0
(9*x+8)/(10*x-11) >= 0
(9*x+8)/(10*x-11) >= 0 // * (10*x-11)^2
(9*x+8)*(10*x-11) >= 0
( 10*x-11 )
10*x-11 >= 0 // + 11
10*x >= 11 // : 10
x >= 11/10
( 9*x+8 )
9*x+8 >= 0 // - 8
9*x >= -8 // : 9
x >= -8/9
(-oo:-8/9) (-8/9:11/10) (11/10:+oo) 10*x-11 - - + 9*x+8 - + +
x in (-oo:-8/9> U (11/10:+oo)
(-oo:-8/9> U (11/10:+oo)
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