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n in (-oo:+oo)
(7/6)*n-((5/5)*n^2)-(84*n)-(40*n)+288 = 0
(7/6)*n-n^2-84*n-40*n+288 = 0
288-n^2-737/6*n = 0
DELTA = (-737/6)^2-(-1*4*288)
DELTA = 584641/36
DELTA > 0
n = ((584641/36)^(1/2)+737/6)/(-1*2) or n = (737/6-(584641/36)^(1/2))/(-1*2)
n = ((584641/36)^(1/2)+737/6)/(-2) or n = (737/6-(584641/36)^(1/2))/(-2)
n in { ((584641/36)^(1/2)+737/6)/(-2), (737/6-(584641/36)^(1/2))/(-2) }
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