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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
2/10 = 2/w // - 2/w
2/10-(2/w) = 0
2/10-2*w^-1 = 0
-2*w^-1 = -1/5 // : -2
w^-1 = 1/10
-1 < 0
1/(w^1) = 1/10 // * w^1
1 = 1/10*w^1 // : 1/10
10 = w^1
w = 10
w = 10
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