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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
15/y = 12/y-2 // - 12/y-2
15/y-(12/y)+2 = 0
15/y-12*y^-1+2 = 0
3*y^-1 = -2 // : 3
y^-1 = -2/3
-1 < 0
1/(y^1) = -2/3 // * y^1
1 = -2/3*y^1 // : -2/3
-3/2 = y^1
y = -3/2
y = -3/2
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