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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
40/w = 6/8 // - 6/8
40/w-(6/8) = 0
40/w-3/4 = 0
40*w^-1 = 3/4 // : 40
w^-1 = 3/160
-1 < 0
1/(w^1) = 3/160 // * w^1
1 = 3/160*w^1 // : 3/160
160/3 = w^1
w = 160/3
w = 160/3
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