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D( x )
3*x-5 = 0
3*x-5 = 0
3*x-5 = 0
3*x-5 = 0 // + 5
3*x = 5 // : 3
x = 5/3
x in (-oo:5/3) U (5/3:+oo)
x/(3*x-5) <= -5 // + 5
x/(3*x-5)+5 <= 0
x/(3*x-5)+(5*(3*x-5))/(3*x-5) <= 0
5*(3*x-5)+x <= 0
16*x-25 <= 0
(16*x-25)/(3*x-5) <= 0
(16*x-25)/(3*x-5) <= 0 // * (3*x-5)^2
(16*x-25)*(3*x-5) <= 0
( 16*x-25 )
16*x-25 <= 0 // + 25
16*x <= 25 // : 16
x <= 25/16
( 3*x-5 )
3*x-5 <= 0 // + 5
3*x <= 5 // : 3
x <= 5/3
(-oo:25/16) (25/16:5/3) (5/3:+oo) 16*x-25 - + + 3*x-5 - - +
x in <25/16:5/3)
<25/16:5/3)
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