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D( w )
-w = 0
-w = 0
w = 0
w in (-oo:0) U (0:+oo)
-5/(-w)-6 = 3 // - 3
-5/(-w)-6-3 = 0
5*w^-1 = 9 // : 5
w^-1 = 9/5
-1 < 0
1/(w^1) = 9/5 // * w^1
1 = 9/5*w^1 // : 9/5
5/9 = w^1
w = 5/9
w = 5/9
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