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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
16/y-1 = 12 // - 12
16/y-12-1 = 0
16*y^-1 = 13 // : 16
y^-1 = 13/16
-1 < 0
1/(y^1) = 13/16 // * y^1
1 = 13/16*y^1 // : 13/16
16/13 = y^1
y = 16/13
y = 16/13
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