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x in (-oo:+oo)
2-((1/2)*x) < 5 // - 5
2-((1/2)*x)-5 < 0
(-1/2)*x-5+2 < 0
-1/2*x-3 < 0 // + 3
-1/2*x < 3 // : -1/2
x > 3/(-1/2)
x > -6
x in (-6:+oo)
(-6:+oo)
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