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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
2 = 18/w // - 18/w
2-(18/w) = 0
2-18*w^-1 = 0
-18*w^-1 = -2 // : -18
w^-1 = 1/9
-1 < 0
1/(w^1) = 1/9 // * w^1
1 = 1/9*w^1 // : 1/9
9 = w^1
w = 9
w = 9
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