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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
5 = 23/w // - 23/w
5-(23/w) = 0
5-23*w^-1 = 0
-23*w^-1 = -5 // : -23
w^-1 = 5/23
-1 < 0
1/(w^1) = 5/23 // * w^1
1 = 5/23*w^1 // : 5/23
23/5 = w^1
w = 23/5
w = 23/5
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