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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(2*y+3)/y = 3/2 // - 3/2
(2*y+3)/y-(3/2) = 0
(2*y+3)/y-3/2 = 0
(2*(2*y+3))/(2*y)+(-3*y)/(2*y) = 0
2*(2*y+3)-3*y = 0
y+6 = 0
(y+6)/(2*y) = 0
(y+6)/(2*y) = 0 // * 2*y
y+6 = 0
y+6 = 0 // - 6
y = -6
y = -6
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