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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
17 = 119/w // - 119/w
17-(119/w) = 0
17-119*w^-1 = 0
-119*w^-1 = -17 // : -119
w^-1 = 1/7
-1 < 0
1/(w^1) = 1/7 // * w^1
1 = 1/7*w^1 // : 1/7
7 = w^1
w = 7
w = 7
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