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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
11/7 = 5/y // - 5/y
11/7-(5/y) = 0
11/7-5*y^-1 = 0
-5*y^-1 = -11/7 // : -5
y^-1 = 11/35
-1 < 0
1/(y^1) = 11/35 // * y^1
1 = 11/35*y^1 // : 11/35
35/11 = y^1
y = 35/11
y = 35/11
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