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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
-12.24/w = 3 // - 3
-12.24/w-3 = 0
-12.24*w^-1 = 3 // : -12.24
w^-1 = -0.24509804
-1 < 0
1/(w^1) = -0.24509804 // * w^1
1 = -0.24509804*w^1 // : -0.24509804
-4.07999999 = w^1
w = -4.07999999
w = -4.07999999
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