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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(8*y)/y-10+6 = (2*y)/y-10 // - (2*y)/y-10
(8*y)/y-((2*y)/y)-10+6+10 = 0
(8*y)/y-10-2+6+10 = 0
12 = 0
y belongs to the empty set
y belongs to the empty set
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