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x in (-oo:+oo)
N/2-9 = 4*n+5 // - 4*n+5
N/2-(4*n)-9-5 = 0
N/2-4*n-9-5 = 0
1/2*N-4*n-14 = 0
x naleu017Cy do R
x in (-oo:+oo)
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