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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
4/w = -6 // + 6
4/w+6 = 0
4*w^-1 = -6 // : 4
w^-1 = -3/2
-1 < 0
1/(w^1) = -3/2 // * w^1
1 = -3/2*w^1 // : -3/2
-2/3 = w^1
w = -2/3
w = -2/3
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