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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
5.5/6 = 16.5/w // - 16.5/w
5.5/6-(16.5/w) = 0
5.5/6-16.5*w^-1 = 0
-16.5*w^-1 = -0.91666667 // : -16.5
w^-1 = 0.05555556
-1 < 0
1/(w^1) = 0.05555556 // * w^1
1 = 0.05555556*w^1 // : 0.05555556
17.99999856 = w^1
w = 17.99999856
w = 17.99999856
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