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x in (-oo:+oo)
i = 1.08*(8/N) // - 1.08*(8/N)
i-(1.08*(8/N)) = 0
i-8.64*N^-1 = 0
i-8.64*N^-1 = 0
x naleu017Cy do R
x in (-oo:+oo)
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