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x in (-oo:+oo)
(1/2)*x-3 > 5 // - 5
(1/2)*x-5-3 > 0
1/2*x-8 > 0 // + 8
1/2*x > 8 // : 1/2
x > 8/1/2
x > 16
x in (16:+oo)
(16:+oo)
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