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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
8/y-(2/11) = 4 // - 4
8/y-(2/11)-4 = 0
8/y-2/11-4 = 0
8*y^-1 = 46/11 // : 8
y^-1 = 23/44
-1 < 0
1/(y^1) = 23/44 // * y^1
1 = 23/44*y^1 // : 23/44
44/23 = y^1
y = 44/23
y = 44/23
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