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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
8/w = 9/15 // - 9/15
8/w-(9/15) = 0
8/w-3/5 = 0
8*w^-1 = 3/5 // : 8
w^-1 = 3/40
-1 < 0
1/(w^1) = 3/40 // * w^1
1 = 3/40*w^1 // : 3/40
40/3 = w^1
w = 40/3
w = 40/3
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