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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
-(9/w) = -6 // + 6
6-(9/w) = 0
6-9*w^-1 = 0
-9*w^-1 = -6 // : -9
w^-1 = 2/3
-1 < 0
1/(w^1) = 2/3 // * w^1
1 = 2/3*w^1 // : 2/3
3/2 = w^1
w = 3/2
w = 3/2
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