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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
5/9 = 3/w // - 3/w
5/9-(3/w) = 0
5/9-3*w^-1 = 0
-3*w^-1 = -5/9 // : -3
w^-1 = 5/27
-1 < 0
1/(w^1) = 5/27 // * w^1
1 = 5/27*w^1 // : 5/27
27/5 = w^1
w = 27/5
w = 27/5
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