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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+14*x+48/x+6 = 0
15*x^1+48*x^-1+6*x^0 = 0
(15*x^2+6*x^1+48*x^0)/(x^1) = 0 // * x^2
x^1*(15*x^2+6*x^1+48*x^0) = 0
x^1
15*x^2+6*x+48 = 0
15*x^2+6*x+48 = 0
DELTA = 6^2-(4*15*48)
DELTA = -2844
DELTA < 0
x in { }
x belongs to the empty set
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