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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
15.125/w = 605 // - 605
15.125/w-605 = 0
15.125*w^-1 = 605 // : 15.125
w^-1 = 40
-1 < 0
1/(w^1) = 40 // * w^1
1 = 40*w^1 // : 40
1/40 = w^1
w = 1/40
w = 1/40
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