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