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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
56/w = 4/6 // - 4/6
56/w-(4/6) = 0
56/w-2/3 = 0
56*w^-1 = 2/3 // : 56
w^-1 = 1/84
-1 < 0
1/(w^1) = 1/84 // * w^1
1 = 1/84*w^1 // : 1/84
84 = w^1
w = 84
w = 84
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