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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
18/w = 2/3 // - 2/3
18/w-(2/3) = 0
18/w-2/3 = 0
18*w^-1 = 2/3 // : 18
w^-1 = 1/27
-1 < 0
1/(w^1) = 1/27 // * w^1
1 = 1/27*w^1 // : 1/27
27 = w^1
w = 27
w = 27
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