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D( y )
y = 0
y = 0
y = 0
y in (-oo:0) U (0:+oo)
16/y = -4 // + 4
16/y+4 = 0
16*y^-1 = -4 // : 16
y^-1 = -1/4
-1 < 0
1/(y^1) = -1/4 // * y^1
1 = -1/4*y^1 // : -1/4
-4 = y^1
y = -4
y = -4
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