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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
2 = 25/w // - 25/w
2-(25/w) = 0
2-25*w^-1 = 0
-25*w^-1 = -2 // : -25
w^-1 = 2/25
-1 < 0
1/(w^1) = 2/25 // * w^1
1 = 2/25*w^1 // : 2/25
25/2 = w^1
w = 25/2
w = 25/2
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