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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
8/w = 6/54 // - 6/54
8/w-(6/54) = 0
8/w-1/9 = 0
8*w^-1 = 1/9 // : 8
w^-1 = 1/72
-1 < 0
1/(w^1) = 1/72 // * w^1
1 = 1/72*w^1 // : 1/72
72 = w^1
w = 72
w = 72
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