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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
14*x+3/x = 5*x // - 5*x
14*x-(5*x)+3/x = 0
14*x-5*x+3/x = 0
9*x^1+3*x^-1 = 0
(9*x^2+3*x^0)/(x^1) = 0 // * x^2
x^1*(9*x^2+3*x^0) = 0
x^1
9*x^2+3 = 0
9*x^2+3 = 0
DELTA = 0^2-(3*4*9)
DELTA = -108
DELTA < 0
x in { }
x belongs to the empty set
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