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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
1/w-((1/3)*w)-3+9 = (2/3)*w-9 // - (2/3)*w-9
1/w-((1/3)*w)-((2/3)*w)-3+9+9 = 0
(-1/3)*w+(-2/3)*w+1/w-3+9+9 = 0
1*w^-1-1*w^1+15*w^0 = 0
(15*w^1-1*w^2+1*w^0)/(w^1) = 0 // * w^2
w^1*(15*w^1-1*w^2+1*w^0) = 0
w^1
15*w-w^2+1 = 0
15*w-w^2+1 = 0
DELTA = 15^2-(-1*1*4)
DELTA = 229
DELTA > 0
w = (229^(1/2)-15)/(-1*2) or w = (-229^(1/2)-15)/(-1*2)
w = (229^(1/2)-15)/(-2) or w = (229^(1/2)+15)/2
w in { (229^(1/2)-15)/(-2), (229^(1/2)+15)/2}
w in { (229^(1/2)-15)/(-2), (229^(1/2)+15)/2 }
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