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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
-(5/w-3) = 1-((5/4)*w)+12 // - 1-((5/4)*w)+12
(5/4)*w-(5/w)-12-1+3 = 0
(5/4)*w-5*w^-1-12-1+3 = 0
5/4*w^1-5*w^-1-10*w^0 = 0
(5/4*w^2-10*w^1-5*w^0)/(w^1) = 0 // * w^2
w^1*(5/4*w^2-10*w^1-5*w^0) = 0
w^1
(5/4)*w^2-10*w-5 = 0
(5/4)*w^2-10*w-5 = 0
DELTA = (-10)^2-(-5*4*(5/4))
DELTA = 125
DELTA > 0
w = (125^(1/2)+10)/(2*(5/4)) or w = (10-125^(1/2))/(2*(5/4))
w = 2/5*(5*5^(1/2)+10) or w = 2/5*(10-5*5^(1/2))
w in { 2/5*(10-5*5^(1/2)), 2/5*(5*5^(1/2)+10)}
w in { 2/5*(10-5*5^(1/2)), 2/5*(5*5^(1/2)+10) }
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