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