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D( y )
y^4 = 0
y^4 = 0
y^4 = 0
1*y^4 = 0 // : 1
y^4 = 0
y = 0
y in (-oo:0) U (0:+oo)
(y^7)/(y^4) = 0
1*y^3 = 0 // : 1
y^3 = 0
y = 0
y in { 0}
y belongs to the empty set
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