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x in (-oo:+oo)
x/2-1 > 4 // - 4
x/2-4-1 > 0
1/2*x-5 > 0 // + 5
1/2*x > 5 // : 1/2
x > 5/1/2
x > 10
x in (10:+oo)
(10:+oo)
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