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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
5 = 2.2/w // - 2.2/w
5-(2.2/w) = 0
5-2.2*w^-1 = 0
-2.2*w^-1 = -5 // : -2.2
w^-1 = 2.27272727
-1 < 0
1/(w^1) = 2.27272727 // * w^1
1 = 2.27272727*w^1 // : 2.27272727
0.44 = w^1
w = 0.44
w = 0.44
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