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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
X/x-3+3 = x/x-3 // - x/x-3
X/x-(x/x)-3+3+3 = 0
X/x-3-1+3+3 = 0
X*x^-1 = -2 // : X
x^-1 = -2/X
-1 < 0
1/(x^1) = -2/X // * x^1
1 = (-2/X)*x^1 // : -2/X
1/(-2/X) = x^1
x = 1/(-2/X)
x = 1/(-2/X)
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