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x in (-oo:+oo)
x/2-5 > -3 // + 3
x/2-5+3 > 0
1/2*x-2 > 0 // + 2
1/2*x > 2 // : 1/2
x > 2/1/2
x > 4
x in (4:+oo)
(4:+oo)
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