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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
(3/7)*w+2/w+8 = 0
3/7*w^1+2*w^-1+8*w^0 = 0
(3/7*w^2+8*w^1+2*w^0)/(w^1) = 0 // * w^2
w^1*(3/7*w^2+8*w^1+2*w^0) = 0
w^1
(3/7)*w^2+8*w+2 = 0
(3/7)*w^2+8*w+2 = 0
DELTA = 8^2-(2*4*(3/7))
DELTA = 424/7
DELTA > 0
w = ((424/7)^(1/2)-8)/(2*(3/7)) or w = (-(424/7)^(1/2)-8)/(2*(3/7))
w = 7/6*((424/7)^(1/2)-8) or w = -7/6*((424/7)^(1/2)+8)
w in { -7/6*((424/7)^(1/2)+8), 7/6*((424/7)^(1/2)-8)}
w in { -7/6*((424/7)^(1/2)+8), 7/6*((424/7)^(1/2)-8) }
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