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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
10/13 = 3/w // - 3/w
10/13-(3/w) = 0
10/13-3*w^-1 = 0
-3*w^-1 = -10/13 // : -3
w^-1 = 10/39
-1 < 0
1/(w^1) = 10/39 // * w^1
1 = 10/39*w^1 // : 10/39
39/10 = w^1
w = 39/10
w = 39/10
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