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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(3*y)/y-(((11*y)/4)*y)-16-4 = 0
(-11/4)*y^2+(3*y)/y-16-4 = 0
-11/4*y^2 = 17 // : -11/4
y^2 = -68/11
y belongs to the empty set
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