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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
5*w-(2/w)-3 = 0
5*w-2*w^-1-3 = 0
5*w^1-2*w^-1-3*w^0 = 0
(5*w^2-3*w^1-2*w^0)/(w^1) = 0 // * w^2
w^1*(5*w^2-3*w^1-2*w^0) = 0
w^1
5*w^2-3*w-2 = 0
5*w^2-3*w-2 = 0
DELTA = (-3)^2-(-2*4*5)
DELTA = 49
DELTA > 0
w = (49^(1/2)+3)/(2*5) or w = (3-49^(1/2))/(2*5)
w = 1 or w = -2/5
w in { -2/5, 1}
w in { -2/5, 1 }
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