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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
5/w-1 = 2/w-9+1 // - 2/w-9+1
5/w-(2/w)-1-1+9 = 0
5/w-2*w^-1-1-1+9 = 0
3*w^-1 = -7 // : 3
w^-1 = -7/3
-1 < 0
1/(w^1) = -7/3 // * w^1
1 = -7/3*w^1 // : -7/3
-3/7 = w^1
w = -3/7
w = -3/7
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