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