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D( n )
-n = 0
-n = 0
n = 0
n in (-oo:0) U (0:+oo)
(5/2)*n+4/3 = -1/(-n) // + -1/(-n)
(5/2)*n-(-1/(-n))+4/3 = 0
(5/2)*n-n^-1+4/3 = 0
5/2*n^1-1*n^-1+4/3*n^0 = 0
(5/2*n^2+4/3*n^1-1*n^0)/(n^1) = 0 // * n^2
n^1*(5/2*n^2+4/3*n^1-1*n^0) = 0
n^1
(5/2)*n^2+(4/3)*n-1 = 0
(5/2)*n^2+(4/3)*n-1 = 0
DELTA = (4/3)^2-(-1*4*(5/2))
DELTA = 106/9
DELTA > 0
n = ((106/9)^(1/2)-(4/3))/(2*(5/2)) or n = (-(4/3)-(106/9)^(1/2))/(2*(5/2))
n = ((106/9)^(1/2)-4/3)/5 or n = (-((106/9)^(1/2)+4/3))/5
n in { (-((106/9)^(1/2)+4/3))/5, ((106/9)^(1/2)-4/3)/5}
n in { (-((106/9)^(1/2)+4/3))/5, ((106/9)^(1/2)-4/3)/5 }
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