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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
12/w = 384 // - 384
12/w-384 = 0
12*w^-1 = 384 // : 12
w^-1 = 32
-1 < 0
1/(w^1) = 32 // * w^1
1 = 32*w^1 // : 32
1/32 = w^1
w = 1/32
w = 1/32
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