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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X/x+3 = 7/6 // - 7/6
X/x-(7/6)+3 = 0
X/x-7/6+3 = 0
X*x^-1 = -11/6 // : X
x^-1 = -11/6/X
-1 < 0
1/(x^1) = -11/6/X // * x^1
1 = (-11/6/X)*x^1 // : -11/6/X
-6/11*X = x^1
x = -6/11*X
x = -6/11*X
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