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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
5/8 = 11/y // - 11/y
5/8-(11/y) = 0
5/8-11*y^-1 = 0
-11*y^-1 = -5/8 // : -11
y^-1 = 5/88
-1 < 0
1/(y^1) = 5/88 // * y^1
1 = 5/88*y^1 // : 5/88
88/5 = y^1
y = 88/5
y = 88/5
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