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x in (-oo:+oo)
5*x-1 < 2-(x/(-2)) // - 2-(x/(-2))
5*x+x/(-2)-2-1 < 0
9/2*x-3 < 0 // + 3
9/2*x < 3 // : 9/2
x < 3/9/2
x < 2/3
x in (-oo:2/3)
(-oo:2/3)
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