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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
3/w = 66 // - 66
3/w-66 = 0
3*w^-1 = 66 // : 3
w^-1 = 22
-1 < 0
1/(w^1) = 22 // * w^1
1 = 22*w^1 // : 22
1/22 = w^1
w = 1/22
w = 1/22
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