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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5/9 = 3/y // - 3/y
5/9-(3/y) = 0
5/9-3*y^-1 = 0
-3*y^-1 = -5/9 // : -3
y^-1 = 5/27
-1 < 0
1/(y^1) = 5/27 // * y^1
1 = 5/27*y^1 // : 5/27
27/5 = y^1
y = 27/5
y = 27/5
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