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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
2/y+5/2 = 4-((2/3)*y) // - 4-((2/3)*y)
(2/3)*y+2/y+5/2-4 = 0
2/3*y^1+2*y^-1-3/2*y^0 = 0
(2/3*y^2-3/2*y^1+2*y^0)/(y^1) = 0 // * y^2
y^1*(2/3*y^2-3/2*y^1+2*y^0) = 0
y^1
(2/3)*y^2+(-3/2)*y+2 = 0
(2/3)*y^2+(-3/2)*y+2 = 0
DELTA = (-3/2)^2-(2*4*(2/3))
DELTA = -37/12
DELTA < 0
y in { }
y belongs to the empty set
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