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D( y )
(10/2)*y = 0
(10/2)*y = 0
(10/2)*y = 0
5*y = 0 // : 5
y = 0
y in (-oo:0) U (0:+oo)
((9/2)*y^2)/((10/2)*y) = 0
9/10*y = 0 // : 9/10
y = 0
y in { 0}
y belongs to the empty set
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