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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
99/w+8 = 11 // - 11
99/w-11+8 = 0
99*w^-1 = 3 // : 99
w^-1 = 1/33
-1 < 0
1/(w^1) = 1/33 // * w^1
1 = 1/33*w^1 // : 1/33
33 = w^1
w = 33
w = 33
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