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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
10/w = 2/w+4 // - 2/w+4
10/w-(2/w)-4 = 0
10/w-2*w^-1-4 = 0
8*w^-1 = 4 // : 8
w^-1 = 1/2
-1 < 0
1/(w^1) = 1/2 // * w^1
1 = 1/2*w^1 // : 1/2
2 = w^1
w = 2
w = 2
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