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D( y )
(15*y^1)/4 = 0
(15*y^1)/4 = 0
(15*y^1)/4 = 0
(15*y)/4 = 0
15/4*y = 0 // : 15/4
y = 0
y in (-oo:0) U (0:+oo)
((5*y^2)/3)/((15*y^1)/4) = 0
((5*y^2)/3)/((15*y)/4) = 0
4/9*y = 0 // : 4/9
y = 0
y in { 0}
y belongs to the empty set
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