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