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r in (-oo:+oo)
2*r-(31/4) < 21/2 // - 21/2
2*r-(31/4)-(21/2) < 0
2*r-31/4-21/2 < 0
2*r-73/4 < 0 // + 73/4
2*r < 73/4 // : 2
r < 73/4/2
r < 73/8
r in (-oo:73/8)
(-oo:73/8)
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