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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
9-(12/w) = -12 // + 12
9-(12/w)+12 = 0
9-12*w^-1+12 = 0
-12*w^-1 = -21 // : -12
w^-1 = 7/4
-1 < 0
1/(w^1) = 7/4 // * w^1
1 = 7/4*w^1 // : 7/4
4/7 = w^1
w = 4/7
w = 4/7
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