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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
12/18 = 2/w // - 2/w
12/18-(2/w) = 0
12/18-2*w^-1 = 0
-2*w^-1 = -2/3 // : -2
w^-1 = 1/3
-1 < 0
1/(w^1) = 1/3 // * w^1
1 = 1/3*w^1 // : 1/3
3 = w^1
w = 3
w = 3
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