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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
4/0.8 = 0.3/w // - 0.3/w
4/0.8-(0.3/w) = 0
4/0.8-0.3*w^-1 = 0
-0.3*w^-1 = -5 // : -0.3
w^-1 = 16.66666667
-1 < 0
1/(w^1) = 16.66666667 // * w^1
1 = 16.66666667*w^1 // : 16.66666667
0.06 = w^1
w = 0.06
w = 0.06
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