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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
2/w = 12/3 // - 12/3
2/w-(12/3) = 0
2/w-4 = 0
2*w^-1 = 4 // : 2
w^-1 = 2
-1 < 0
1/(w^1) = 2 // * w^1
1 = 2*w^1 // : 2
1/2 = w^1
w = 1/2
w = 1/2
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