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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
w-(3/w)+8 = 2/7 // - 2/7
w-(3/w)-(2/7)+8 = 0
w-3*w^-1-2/7+8 = 0
1*w^1-3*w^-1+54/7*w^0 = 0
(1*w^2+54/7*w^1-3*w^0)/(w^1) = 0 // * w^2
w^1*(1*w^2+54/7*w^1-3*w^0) = 0
w^1
w^2+(54/7)*w-3 = 0
w^2+(54/7)*w-3 = 0
DELTA = (54/7)^2-(-3*1*4)
DELTA = 3504/49
DELTA > 0
w = ((3504/49)^(1/2)-(54/7))/(1*2) or w = (-(54/7)-(3504/49)^(1/2))/(1*2)
w = ((3504/49)^(1/2)-54/7)/2 or w = (-((3504/49)^(1/2)+54/7))/2
w in { (-((3504/49)^(1/2)+54/7))/2, ((3504/49)^(1/2)-54/7)/2}
w in { (-((3504/49)^(1/2)+54/7))/2, ((3504/49)^(1/2)-54/7)/2 }
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