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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
3/24 = 8/w // - 8/w
3/24-(8/w) = 0
3/24-8*w^-1 = 0
-8*w^-1 = -1/8 // : -8
w^-1 = 1/64
-1 < 0
1/(w^1) = 1/64 // * w^1
1 = 1/64*w^1 // : 1/64
64 = w^1
w = 64
w = 64
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