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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
6/w = 11 // - 11
6/w-11 = 0
6*w^-1 = 11 // : 6
w^-1 = 11/6
-1 < 0
1/(w^1) = 11/6 // * w^1
1 = 11/6*w^1 // : 11/6
6/11 = w^1
w = 6/11
w = 6/11
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