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n in (-oo:+oo)
((7*n)/24)*n^3-(9*64*n)-((24/7)*n) = 0
((7*n)/24)*n^3-576*n+(-24/7)*n = 0
7/24*n^4-4056/7*n = 0
n*(7/24*n^3-4056/7) = 0
7/24*n^3 = 4056/7 // : 7/24
n^3 = 97344/49
n^3 = 97344/49 // ^ 1/3
n = (97344/49)^(1/3)
n = 0
n = 0
n in { (97344/49)^(1/3), 0 }
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