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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
(2/4)/w = 60/100 // - 60/100
(2/4)/w-(60/100) = 0
(2/4)/w-3/5 = 0
1/2*w^-1 = 3/5 // : 1/2
w^-1 = 6/5
-1 < 0
1/(w^1) = 6/5 // * w^1
1 = 6/5*w^1 // : 6/5
5/6 = w^1
w = 5/6
w = 5/6
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