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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
3/w-4 = 0
3*w^-1 = 4 // : 3
w^-1 = 4/3
-1 < 0
1/(w^1) = 4/3 // * w^1
1 = 4/3*w^1 // : 4/3
3/4 = w^1
w = 3/4
w = 3/4
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