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x in (-oo:+oo)
3*x-(1/2) > 6 // - 6
3*x-(1/2)-6 > 0
3*x-1/2-6 > 0
3*x-13/2 > 0 // + 13/2
3*x > 13/2 // : 3
x > 13/2/3
x > 13/6
x in (13/6:+oo)
(13/6:+oo)
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