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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
12.8/w = 8 // - 8
12.8/w-8 = 0
12.8*w^-1 = 8 // : 12.8
w^-1 = 0.625
-1 < 0
1/(w^1) = 0.625 // * w^1
1 = 0.625*w^1 // : 0.625
1.6 = w^1
w = 1.6
w = 1.6
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