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N in (-oo:+oo)
(N^3)/2 = 125 // - 125
(N^3)/2-125 = 0
1/2*N^3 = 125 // : 1/2
N^3 = 250
N^3 = 250 // ^ 1/3
N = 5*2^(1/3)
N = 5*2^(1/3)
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