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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
635/w = 25 // - 25
635/w-25 = 0
635*w^-1 = 25 // : 635
w^-1 = 5/127
-1 < 0
1/(w^1) = 5/127 // * w^1
1 = 5/127*w^1 // : 5/127
127/5 = w^1
w = 127/5
w = 127/5
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