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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
w-(4/w)-6-1 = w+1/w-3 // - w+1/w-3
w-w-(4/w)-(1/w)-6-1+3 = 0
w-w-4*w^-1-w^-1-6-1+3 = 0
-5*w^-1 = 4 // : -5
w^-1 = -4/5
-1 < 0
1/(w^1) = -4/5 // * w^1
1 = -4/5*w^1 // : -4/5
-5/4 = w^1
w = -5/4
w = -5/4
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