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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
8/y-(1/3) = 5/y // - 5/y
8/y-(5/y)-(1/3) = 0
8/y-5*y^-1-1/3 = 0
3*y^-1 = 1/3 // : 3
y^-1 = 1/9
-1 < 0
1/(y^1) = 1/9 // * y^1
1 = 1/9*y^1 // : 1/9
9 = y^1
y = 9
y = 9
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