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n in (-oo:+oo)
n/2 = n^2-6 // - n^2-6
n/2-n^2+6 = 0
1/2*n-n^2+6 = 0
DELTA = (1/2)^2-(-1*4*6)
DELTA = 97/4
DELTA > 0
n = ((97/4)^(1/2)-1/2)/(-1*2) or n = (-(97/4)^(1/2)-1/2)/(-1*2)
n = ((97/4)^(1/2)-1/2)/(-2) or n = ((97/4)^(1/2)+1/2)/2
n in { ((97/4)^(1/2)-1/2)/(-2), ((97/4)^(1/2)+1/2)/2 }
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