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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
7/w-5 = 3 // - 3
7/w-5-3 = 0
7*w^-1 = 8 // : 7
w^-1 = 8/7
-1 < 0
1/(w^1) = 8/7 // * w^1
1 = 8/7*w^1 // : 8/7
7/8 = w^1
w = 7/8
w = 7/8
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