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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
w/w-6-2 = 2/w-2 // - 2/w-2
w/w-(2/w)-6-2+2 = 0
w/w-2*w^-1-6-2+2 = 0
-2*w^-1 = 5 // : -2
w^-1 = -5/2
-1 < 0
1/(w^1) = -5/2 // * w^1
1 = -5/2*w^1 // : -5/2
-2/5 = w^1
w = -2/5
w = -2/5
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