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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
-6 = -8/w // + -8/w
-(-8/w)-6 = 0
8*w^-1-6 = 0
8*w^-1 = 6 // : 8
w^-1 = 3/4
-1 < 0
1/(w^1) = 3/4 // * w^1
1 = 3/4*w^1 // : 3/4
4/3 = w^1
w = 4/3
w = 4/3
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