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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(9*y)/y-6+2 = (7*y)/y-6 // - (7*y)/y-6
(9*y)/y-((7*y)/y)-6+2+6 = 0
(9*y)/y-7-6+2+6 = 0
4 = 0
y belongs to the empty set
y belongs to the empty set
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