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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
11/13 = 5/y // - 5/y
11/13-(5/y) = 0
11/13-5*y^-1 = 0
-5*y^-1 = -11/13 // : -5
y^-1 = 11/65
-1 < 0
1/(y^1) = 11/65 // * y^1
1 = 11/65*y^1 // : 11/65
65/11 = y^1
y = 65/11
y = 65/11
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