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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
w+5/w+1+4 = w-(3/w)+1 // - w-(3/w)+1
w-w+5/w+3/w-1+1+4 = 0
8*w^-1 = -4 // : 8
w^-1 = -1/2
-1 < 0
1/(w^1) = -1/2 // * w^1
1 = -1/2*w^1 // : -1/2
-2 = w^1
w = -2
w = -2
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