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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
9 = 2/w-3 // - 2/w-3
3-(2/w)+9 = 0
3-2*w^-1+9 = 0
-2*w^-1 = -12 // : -2
w^-1 = 6
-1 < 0
1/(w^1) = 6 // * w^1
1 = 6*w^1 // : 6
1/6 = w^1
w = 1/6
w = 1/6
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