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