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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
8 = -5/w-4 // + -5/w-4
4-(-5/w)+8 = 0
5*w^-1+4+8 = 0
5*w^-1 = -12 // : 5
w^-1 = -12/5
-1 < 0
1/(w^1) = -12/5 // * w^1
1 = -12/5*w^1 // : -12/5
-5/12 = w^1
w = -5/12
w = -5/12
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