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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
-5 = 4/w+5 // - 4/w+5
-(4/w)-5-5 = 0
-4*w^-1-5-5 = 0
-4*w^-1 = 10 // : -4
w^-1 = -5/2
-1 < 0
1/(w^1) = -5/2 // * w^1
1 = -5/2*w^1 // : -5/2
-2/5 = w^1
w = -2/5
w = -2/5
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