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