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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
8/w = 9-4 // - 9-4
8/w-9+4 = 0
8*w^-1 = 5 // : 8
w^-1 = 5/8
-1 < 0
1/(w^1) = 5/8 // * w^1
1 = 5/8*w^1 // : 5/8
8/5 = w^1
w = 8/5
w = 8/5
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