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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
1/y = 8-(3/y) // - 8-(3/y)
1/y+3/y-8 = 0
4*y^-1 = 8 // : 4
y^-1 = 2
-1 < 0
1/(y^1) = 2 // * y^1
1 = 2*y^1 // : 2
1/2 = y^1
y = 1/2
y = 1/2
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