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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
6/13 = 5/y // - 5/y
6/13-(5/y) = 0
6/13-5*y^-1 = 0
-5*y^-1 = -6/13 // : -5
y^-1 = 6/65
-1 < 0
1/(y^1) = 6/65 // * y^1
1 = 6/65*y^1 // : 6/65
65/6 = y^1
y = 65/6
y = 65/6
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