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n in (-oo:+oo)
n/2+n/4+n/8 = 14 // - 14
n/2+n/4+n/8-14 = 0
7/8*n-14 = 0 // + 14
7/8*n = 14 // : 7/8
n = 14/7/8
n = 16
n = 16
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