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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
8/y-2 = 3 // - 3
8/y-3-2 = 0
8*y^-1 = 5 // : 8
y^-1 = 5/8
-1 < 0
1/(y^1) = 5/8 // * y^1
1 = 5/8*y^1 // : 5/8
8/5 = y^1
y = 8/5
y = 8/5
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