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n in (-oo:+oo)
n-(1/5) < 2/7 // - 2/7
n-(1/5)-(2/7) < 0
n-1/5-2/7 < 0
n-17/35 < 0 // + 17/35
n < 17/35
n in (-oo:17/35)
(-oo:17/35)
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