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D( y )
(11/2)*y = 0
(11/2)*y = 0
(11/2)*y = 0
11/2*y = 0 // : 11/2
y = 0
y in (-oo:0) U (0:+oo)
((7*y)/9)/((11/2)*y) = 0
14/99 = 0
y belongs to the empty set
y belongs to the empty set
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