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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
6 = -8/w // + -8/w
6-(-8/w) = 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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