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