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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
3*y+192/y = 0
3*y^1+192*y^-1 = 0
(3*y^2+192*y^0)/(y^1) = 0 // * y^2
y^1*(3*y^2+192*y^0) = 0
y^1
3*y^2+192 = 0
3*y^2+192 = 0
DELTA = 0^2-(3*4*192)
DELTA = -2304
DELTA < 0
y in { }
y belongs to the empty set
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