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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
2-(3/w)+4 = 5/w-1 // - 5/w-1
1-(3/w)-(5/w)+2+4 = 0
1-3*w^-1-5*w^-1+2+4 = 0
-8*w^-1 = -7 // : -8
w^-1 = 7/8
-1 < 0
1/(w^1) = 7/8 // * w^1
1 = 7/8*w^1 // : 7/8
8/7 = w^1
w = 8/7
w = 8/7
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