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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
4/y+5/y-3+2 = 9/y+5 // - 9/y+5
4/y+5/y-(9/y)-5-3+2 = 0
4/y+5/y-9*y^-1-5-3+2 = 0
-6 = 0
y belongs to the empty set
y belongs to the empty set
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