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D( X )
X-9 = 0
X-9 = 0
X-9 = 0
X-9 = 0 // + 9
X = 9
X in (-oo:9) U (9:+oo)
(X-5)/(X-9) = 0
X-5 = 0 // + 5
X = 5
X = 5
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