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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
2/w = 3/8 // - 3/8
2/w-(3/8) = 0
2/w-3/8 = 0
2*w^-1 = 3/8 // : 2
w^-1 = 3/16
-1 < 0
1/(w^1) = 3/16 // * w^1
1 = 3/16*w^1 // : 3/16
16/3 = w^1
w = 16/3
w = 16/3
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