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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
1/w-((2/3)*w)-9-3 = (1/3)*w-9 // - (1/3)*w-9
1/w-((2/3)*w)-((1/3)*w)-9-3+9 = 0
(-2/3)*w+(-1/3)*w+1/w-9-3+9 = 0
1*w^-1-1*w^1-3*w^0 = 0
(1*w^0-1*w^2-3*w^1)/(w^1) = 0 // * w^2
w^1*(1*w^0-1*w^2-3*w^1) = 0
w^1
1-w^2-3*w = 0
1-w^2-3*w = 0
DELTA = (-3)^2-(-1*1*4)
DELTA = 13
DELTA > 0
w = (13^(1/2)+3)/(-1*2) or w = (3-13^(1/2))/(-1*2)
w = (13^(1/2)+3)/(-2) or w = (3-13^(1/2))/(-2)
w in { (13^(1/2)+3)/(-2), (3-13^(1/2))/(-2)}
w in { (13^(1/2)+3)/(-2), (3-13^(1/2))/(-2) }
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