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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
(2/3)/y = 4/9 // - 4/9
(2/3)/y-(4/9) = 0
(2/3)/y-4/9 = 0
2/3*y^-1 = 4/9 // : 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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