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