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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
y-(1/y)-3 = y-(1/y)+1+5 // - y-(1/y)+1+5
y-y-(1/y)+1/y-5-3-1 = 0
y-y-y^-1+1/y-5-3-1 = 0
-9 = 0
y belongs to the empty set
y belongs to the empty set
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