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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
-0.06/w = 8.48 // - 8.48
-0.06/w-8.48 = 0
-0.06*w^-1 = 8.48 // : -0.06
w^-1 = -141.33333333
-1 < 0
1/(w^1) = -141.33333333 // * w^1
1 = -141.33333333*w^1 // : -141.33333333
-0.00707547 = w^1
w = -0.00707547
w = -0.00707547
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