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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(6*y)/y-10 = (9*y)/y-10 // - (9*y)/y-10
(6*y)/y-((9*y)/y)-10+10 = 0
(6*y)/y-10-9+10 = 0
-3 = 0
y belongs to the empty set
y belongs to the empty set
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