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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
6/w = 42 // - 42
6/w-42 = 0
6*w^-1 = 42 // : 6
w^-1 = 7
-1 < 0
1/(w^1) = 7 // * w^1
1 = 7*w^1 // : 7
1/7 = w^1
w = 1/7
w = 1/7
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