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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
3/y-3 = 1/9 // - 1/9
3/y-(1/9)-3 = 0
3/y-1/9-3 = 0
3*y^-1 = 28/9 // : 3
y^-1 = 28/27
-1 < 0
1/(y^1) = 28/27 // * y^1
1 = 28/27*y^1 // : 28/27
27/28 = y^1
y = 27/28
y = 27/28
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