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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1/4-(11/12) = 1/y // - 1/y
1/4-(1/y)-(11/12) = 0
1/4-y^-1-11/12 = 0
-1*y^-1 = 2/3 // : -1
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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