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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
14.2/w = 35.5/100 // - 35.5/100
14.2/w-(35.5/100) = 0
14.2/w-0.355 = 0
14.2*w^-1 = 0.355 // : 14.2
w^-1 = 0.025
-1 < 0
1/(w^1) = 0.025 // * w^1
1 = 0.025*w^1 // : 0.025
40 = w^1
w = 40
w = 40
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