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