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D( y )
-9*y = 0
-9*y = 0
-9*y = 0
-9*y = 0 // : -9
y = 0
y in (-oo:0) U (0:+oo)
(45*y)/(-9*y) = 0
-5 = 0
y belongs to the empty set
y belongs to the empty set
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