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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
2/y = 16 // - 16
2/y-16 = 0
2*y^-1 = 16 // : 2
y^-1 = 8
-1 < 0
1/(y^1) = 8 // * y^1
1 = 8*y^1 // : 8
1/8 = y^1
y = 1/8
y = 1/8
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