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x in (-oo:+oo)
x-(1/8) > 1/2 // - 1/2
x-(1/8)-(1/2) > 0
x-1/8-1/2 > 0
x-5/8 > 0 // + 5/8
x > 5/8
x in (5/8:+oo)
(5/8:+oo)
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