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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
3/w = 5/100 // - 5/100
3/w-(5/100) = 0
3/w-1/20 = 0
3*w^-1 = 1/20 // : 3
w^-1 = 1/60
-1 < 0
1/(w^1) = 1/60 // * w^1
1 = 1/60*w^1 // : 1/60
60 = w^1
w = 60
w = 60
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