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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(9*y)/y-10+4 = (5*y)/y-10 // - (5*y)/y-10
(9*y)/y-((5*y)/y)-10+4+10 = 0
(9*y)/y-10-5+4+10 = 0
8 = 0
y belongs to the empty set
y belongs to the empty set
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