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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
44/w = 11/5 // - 11/5
44/w-(11/5) = 0
44/w-11/5 = 0
44*w^-1 = 11/5 // : 44
w^-1 = 1/20
-1 < 0
1/(w^1) = 1/20 // * w^1
1 = 1/20*w^1 // : 1/20
20 = w^1
w = 20
w = 20
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