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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5/y = 20/27 // - 20/27
5/y-(20/27) = 0
5/y-20/27 = 0
5*y^-1 = 20/27 // : 5
y^-1 = 4/27
-1 < 0
1/(y^1) = 4/27 // * y^1
1 = 4/27*y^1 // : 4/27
27/4 = y^1
y = 27/4
y = 27/4
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