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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
5 = 6/w-5 // - 6/w-5
5-(6/w)+5 = 0
5-6*w^-1+5 = 0
-6*w^-1 = -10 // : -6
w^-1 = 5/3
-1 < 0
1/(w^1) = 5/3 // * w^1
1 = 5/3*w^1 // : 5/3
3/5 = w^1
w = 3/5
w = 3/5
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