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