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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
6/n-(2/3) = (1/2)*n // - (1/2)*n
6/n-((1/2)*n)-(2/3) = 0
(-1/2)*n+6/n-2/3 = 0
6*n^-1-1/2*n^1-2/3*n^0 = 0
(6*n^0-1/2*n^2-2/3*n^1)/(n^1) = 0 // * n^2
n^1*(6*n^0-1/2*n^2-2/3*n^1) = 0
n^1
(-1/2)*n^2+(-2/3)*n+6 = 0
(-1/2)*n^2+(-2/3)*n+6 = 0
DELTA = (-2/3)^2-(4*6*(-1/2))
DELTA = 112/9
DELTA > 0
n = ((112/9)^(1/2)-(-2/3))/(2*(-1/2)) or n = (-(-2/3)-(112/9)^(1/2))/(2*(-1/2))
n = -((112/9)^(1/2)+2/3) or n = (112/9)^(1/2)-2/3
n in { -((112/9)^(1/2)+2/3), (112/9)^(1/2)-2/3}
n in { -((112/9)^(1/2)+2/3), (112/9)^(1/2)-2/3 }
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