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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X/x-2 = 5/4 // - 5/4
X/x-(5/4)-2 = 0
X/x-5/4-2 = 0
X*x^-1 = 13/4 // : X
x^-1 = 13/4/X
-1 < 0
1/(x^1) = 13/4/X // * x^1
1 = (13/4/X)*x^1 // : 13/4/X
4/13*X = x^1
x = 4/13*X
x = 4/13*X
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