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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
(7/5)*w+2/w = 0
7/5*w^1+2*w^-1 = 0
(7/5*w^2+2*w^0)/(w^1) = 0 // * w^2
w^1*(7/5*w^2+2*w^0) = 0
w^1
(7/5)*w^2+2 = 0
(7/5)*w^2+2 = 0
DELTA = 0^2-(2*4*(7/5))
DELTA = -56/5
DELTA < 0
w in { }
w belongs to the empty set
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