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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
4-(6/w) = 8 // - 8
4-(6/w)-8 = 0
4-6*w^-1-8 = 0
-6*w^-1 = 4 // : -6
w^-1 = -2/3
-1 < 0
1/(w^1) = -2/3 // * w^1
1 = -2/3*w^1 // : -2/3
-3/2 = w^1
w = -3/2
w = -3/2
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