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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
((9/2)*y)/y = 57/75 // - 57/75
((9/2)*y)/y-(57/75) = 0
((9/2)*y)/y-19/25 = 0
187/50 = 0
y belongs to the empty set
y belongs to the empty set
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