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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
10/8.7 = 20/w // - 20/w
10/8.7-(20/w) = 0
10/8.7-20*w^-1 = 0
-20*w^-1 = -1.14942529 // : -20
w^-1 = 0.05747126
-1 < 0
1/(w^1) = 0.05747126 // * w^1
1 = 0.05747126*w^1 // : 0.05747126
17.40000132 = w^1
w = 17.40000132
w = 17.40000132
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