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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
78/w = 13/1 // - 13/1
78/w-(13/1) = 0
78/w-13 = 0
78*w^-1 = 13 // : 78
w^-1 = 1/6
-1 < 0
1/(w^1) = 1/6 // * w^1
1 = 1/6*w^1 // : 1/6
6 = w^1
w = 6
w = 6
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