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n in (-oo:+oo)
128 = ((2*n)^3)/2 // - ((2*n)^3)/2
128-(((2*n)^3)/2) = 0
-4*n^3 = -128 // : -4
n^3 = 32
n^3 = 32 // ^ 1/3
n = 2*4^(1/3)
n = 2*4^(1/3)
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