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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
8/y = 2/3 // - 2/3
8/y-(2/3) = 0
8/y-2/3 = 0
8*y^-1 = 2/3 // : 8
y^-1 = 1/12
-1 < 0
1/(y^1) = 1/12 // * y^1
1 = 1/12*y^1 // : 1/12
12 = y^1
y = 12
y = 12
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