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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
(3/4)/w = 75/100 // - 75/100
(3/4)/w-(75/100) = 0
(3/4)/w-3/4 = 0
3/4*w^-1 = 3/4 // : 3/4
w^-1 = 1
-1 < 0
1/(w^1) = 1 // * w^1
1 = 1*w^1 // : 1
1 = w^1
w = 1
w = 1
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