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x in (-oo:+oo)
x-(1/7) > 1/2 // - 1/2
x-(1/7)-(1/2) > 0
x-1/7-1/2 > 0
x-9/14 > 0 // + 9/14
x > 9/14
x in (9/14:+oo)
(9/14:+oo)
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