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x in (-oo:+oo)
2*x-(5/(-8)) < 1-x // - 1-x
2*x+x-(5/(-8))-1 < 0
2*x+x+5/8-1 < 0
3*x-3/8 < 0 // + 3/8
3*x < 3/8 // : 3
x < 3/8/3
x < 1/8
x in (-oo:1/8)
(-oo:1/8)
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