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X in (-oo:+oo)
X-(1/7) > 1/8 // - 1/8
X-(1/7)-(1/8) > 0
X-1/7-1/8 > 0
X-15/56 > 0 // + 15/56
X > 15/56
X in (15/56:+oo)
(15/56:+oo)
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