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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X+1/x = 10/3 // - 10/3
X+1/x-(10/3) = 0
X+1/x-10/3 = 0
1*x^-1 = -(X-10/3) // : 1
x^-1 = 10/3-X
-1 < 0
1/(x^1) = 10/3-X // * x^1
1 = x^1*(10/3-X) // : 10/3-X
1/(10/3-X) = x^1
x = 1/(10/3-X)
x = 1/(10/3-X)
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