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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
4/y = 2/9 // - 2/9
4/y-(2/9) = 0
4/y-2/9 = 0
4*y^-1 = 2/9 // : 4
y^-1 = 1/18
-1 < 0
1/(y^1) = 1/18 // * y^1
1 = 1/18*y^1 // : 1/18
18 = y^1
y = 18
y = 18
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