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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X/x-(1/2) = 6 // - 6
X/x-(1/2)-6 = 0
X/x-1/2-6 = 0
X*x^-1 = 13/2 // : X
x^-1 = 13/2/X
-1 < 0
1/(x^1) = 13/2/X // * x^1
1 = (13/2/X)*x^1 // : 13/2/X
2/13*X = x^1
x = 2/13*X
x = 2/13*X
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