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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
2/w-9 = 11 // - 11
2/w-11-9 = 0
2*w^-1 = 20 // : 2
w^-1 = 10
-1 < 0
1/(w^1) = 10 // * w^1
1 = 10*w^1 // : 10
1/10 = w^1
w = 1/10
w = 1/10
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