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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
4/w-2 = (-3/4)*w-8 // - (-3/4)*w-8
4/w-((-3/4)*w)-2+8 = 0
(3/4)*w+4/w-2+8 = 0
3/4*w^1+4*w^-1+6*w^0 = 0
(3/4*w^2+6*w^1+4*w^0)/(w^1) = 0 // * w^2
w^1*(3/4*w^2+6*w^1+4*w^0) = 0
w^1
(3/4)*w^2+6*w+4 = 0
(3/4)*w^2+6*w+4 = 0
DELTA = 6^2-(4*4*(3/4))
DELTA = 24
DELTA > 0
w = (24^(1/2)-6)/(2*(3/4)) or w = (-24^(1/2)-6)/(2*(3/4))
w = 2/3*(2*6^(1/2)-6) or w = 2/3*(-2*6^(1/2)-6)
w in { 2/3*(-2*6^(1/2)-6), 2/3*(2*6^(1/2)-6)}
w in { 2/3*(-2*6^(1/2)-6), 2/3*(2*6^(1/2)-6) }
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