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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
8/y = 6 // - 6
8/y-6 = 0
8*y^-1 = 6 // : 8
y^-1 = 3/4
-1 < 0
1/(y^1) = 3/4 // * y^1
1 = 3/4*y^1 // : 3/4
4/3 = y^1
y = 4/3
y = 4/3
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