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