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n in (-oo:+oo)
(n*((n^2)/7))/15 = 5 // - 5
(n*((n^2)/7))/15-5 = 0
1/105*n^3 = 5 // : 1/105
n^3 = 525
n^3 = 525 // ^ 1/3
n = 525^(1/3)
n = 525^(1/3)
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