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D( x )
5*x-4 = 0
5*x-4 = 0
5*x-4 = 0
5*x-4 = 0 // + 4
5*x = 4 // : 5
x = 4/5
x in (-oo:4/5) U (4/5:+oo)
(25*x^2-(30*x)+12)/(5*x-4) = 0
(25*x^2-30*x+12)/(5*x-4) = 0
25*x^2-30*x+12 = 0
25*x^2-30*x+12 = 0
DELTA = (-30)^2-(4*12*25)
DELTA = -300
DELTA < 0
1 = 0
1/(5*x-4) = 0
x belongs to the empty set
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