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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
-5/w-5 = 8 // - 8
-5/w-8-5 = 0
-5*w^-1 = 13 // : -5
w^-1 = -13/5
-1 < 0
1/(w^1) = -13/5 // * w^1
1 = -13/5*w^1 // : -13/5
-5/13 = w^1
w = -5/13
w = -5/13
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