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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(15-(-6*y^-1))/4 = 0
(6*y^-1+15)/4 = 0
6*y^-1 = -15 // : 6
y^-1 = -5/2
-1 < 0
1/(y^1) = -5/2 // * y^1
1 = -5/2*y^1 // : -5/2
-2/5 = y^1
y = -2/5
y = -2/5
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