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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
20/w = 12/3 // - 12/3
20/w-(12/3) = 0
20/w-4 = 0
20*w^-1 = 4 // : 20
w^-1 = 1/5
-1 < 0
1/(w^1) = 1/5 // * w^1
1 = 1/5*w^1 // : 1/5
5 = w^1
w = 5
w = 5
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