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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X^2-(2*x)-(19/x)-4 = 0
X^2-2*x-19*x^-1-4 = 0
-2*x^1-19*x^-1-4*x^0 = 0
(-2*x^2-4*x^1-19*x^0)/(x^1) = 0 // * x^2
x^1*(-2*x^2-4*x^1-19*x^0) = 0
x^1
-2*x^2-4*x-19 = 0
-2*x^2-4*x-19 = 0
DELTA = (-4)^2-(-19*(-2)*4)
DELTA = -136
DELTA < 0
x in { }
x belongs to the empty set
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