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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X-(4/x)-3 = x // - x
X-x-(4/x)-3 = 0
X-x-4*x^-1-3 = 0
-1*x^1-4*x^-1-3*x^0 = 0
(-1*x^2-3*x^1-4*x^0)/(x^1) = 0 // * x^2
x^1*(-1*x^2-3*x^1-4*x^0) = 0
x^1
-x^2-3*x-4 = 0
-x^2-3*x-4 = 0
DELTA = (-3)^2-(-4*(-1)*4)
DELTA = -7
DELTA < 0
x in { }
x belongs to the empty set
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