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