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