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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3/4)*x+5/x = 1 // - 1
(3/4)*x+5/x-1 = 0
3/4*x^1+5*x^-1-1*x^0 = 0
(3/4*x^2-1*x^1+5*x^0)/(x^1) = 0 // * x^2
x^1*(3/4*x^2-1*x^1+5*x^0) = 0
x^1
(3/4)*x^2-x+5 = 0
(3/4)*x^2-x+5 = 0
DELTA = (-1)^2-(4*5*(3/4))
DELTA = -14
DELTA < 0
x in { }
x belongs to the empty set
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