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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
11/3 = 5/y // - 5/y
11/3-(5/y) = 0
11/3-5*y^-1 = 0
-5*y^-1 = -11/3 // : -5
y^-1 = 11/15
-1 < 0
1/(y^1) = 11/15 // * y^1
1 = 11/15*y^1 // : 11/15
15/11 = y^1
y = 15/11
y = 15/11
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