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D( X )
X = 0
X = 0
X = 0
X in (-oo:0) U (0:+oo)
0.9 = X/X+35 // - X/X+35
0.9-(X/X)-35 = 0
0.9-35-1 = 0
-35.1 = 0
X belongs to the empty set
X belongs to the empty set
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