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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(4*y)/y+(9*y)/y-8-8+5 = 0
(9*y)/y+(4*y)/y-8-8+5 = 0
(4*y)/y+(9*y)/y-8-8+5 = 0
2 = 0
y belongs to the empty set
y belongs to the empty set
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