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