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