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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
5 = -3/w-5 // + -3/w-5
5-(-3/w)+5 = 0
3*w^-1+5+5 = 0
3*w^-1 = -10 // : 3
w^-1 = -10/3
-1 < 0
1/(w^1) = -10/3 // * w^1
1 = -10/3*w^1 // : -10/3
-3/10 = w^1
w = -3/10
w = -3/10
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