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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X/x-2 = 2/5 // - 2/5
X/x-(2/5)-2 = 0
X/x-2/5-2 = 0
X*x^-1 = 12/5 // : X
x^-1 = 12/5/X
-1 < 0
1/(x^1) = 12/5/X // * x^1
1 = (12/5/X)*x^1 // : 12/5/X
5/12*X = x^1
x = 5/12*X
x = 5/12*X
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