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x in (-oo:+oo)
x-(1/5) > 1/8 // - 1/8
x-(1/5)-(1/8) > 0
x-1/5-1/8 > 0
x-13/40 > 0 // + 13/40
x > 13/40
x in (13/40:+oo)
(13/40:+oo)
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