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