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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
8/w-6 = 7 // - 7
8/w-7-6 = 0
8*w^-1 = 13 // : 8
w^-1 = 13/8
-1 < 0
1/(w^1) = 13/8 // * w^1
1 = 13/8*w^1 // : 13/8
8/13 = w^1
w = 8/13
w = 8/13
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