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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
11/3 = 13/y // - 13/y
11/3-(13/y) = 0
11/3-13*y^-1 = 0
-13*y^-1 = -11/3 // : -13
y^-1 = 11/39
-1 < 0
1/(y^1) = 11/39 // * y^1
1 = 11/39*y^1 // : 11/39
39/11 = y^1
y = 39/11
y = 39/11
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