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