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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
8/y = 96 // - 96
8/y-96 = 0
8*y^-1 = 96 // : 8
y^-1 = 12
-1 < 0
1/(y^1) = 12 // * y^1
1 = 12*y^1 // : 12
1/12 = y^1
y = 1/12
y = 1/12
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