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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X/x+2 = 5/6 // - 5/6
X/x-(5/6)+2 = 0
X/x-5/6+2 = 0
X*x^-1 = -7/6 // : X
x^-1 = -7/6/X
-1 < 0
1/(x^1) = -7/6/X // * x^1
1 = (-7/6/X)*x^1 // : -7/6/X
-6/7*X = x^1
x = -6/7*X
x = -6/7*X
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