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