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D( y )
2*y^5 = 0
2*y^5 = 0
2*y^5 = 0
2*y^5 = 0 // : 2
y^5 = 0
y = 0
y in (-oo:0) U (0:+oo)
((6*y^3)^4)/(2*y^5) = 0
648*y^7 = 0 // : 648
y^7 = 0
y = 0
y in { 0}
y belongs to the empty set
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