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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
6/w = 70 // - 70
6/w-70 = 0
6*w^-1 = 70 // : 6
w^-1 = 35/3
-1 < 0
1/(w^1) = 35/3 // * w^1
1 = 35/3*w^1 // : 35/3
3/35 = w^1
w = 3/35
w = 3/35
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