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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
153/w = 100/2.5 // - 100/2.5
153/w-(100/2.5) = 0
153/w-40 = 0
153*w^-1 = 40 // : 153
w^-1 = 40/153
-1 < 0
1/(w^1) = 40/153 // * w^1
1 = 40/153*w^1 // : 40/153
153/40 = w^1
w = 153/40
w = 153/40
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