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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
55/w = 11/22 // - 11/22
55/w-(11/22) = 0
55/w-1/2 = 0
55*w^-1 = 1/2 // : 55
w^-1 = 1/110
-1 < 0
1/(w^1) = 1/110 // * w^1
1 = 1/110*w^1 // : 1/110
110 = w^1
w = 110
w = 110
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