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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
w/w-3 = 3/w-(3/2)-3 // - 3/w-(3/2)-3
w/w-(3/w)+3/2-3+3 = 0
w/w-3*w^-1+3/2-3+3 = 0
-3*w^-1 = -5/2 // : -3
w^-1 = 5/6
-1 < 0
1/(w^1) = 5/6 // * w^1
1 = 5/6*w^1 // : 5/6
6/5 = w^1
w = 6/5
w = 6/5
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