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