x＜2x+1
    x-3＞0
    x+1＞0
    x≥-1
    x-（x+3）/1＜0
    -2x+6≥10
    3/1（x+3）+2≥1
    3x+5＜4
    0.27+0.12x>=0
    0.27+0.12x<=20
    15.35+x<=25
    15.35+x>=0
    20.11-0.16x>=0
    21.35+0.25x>=0
    13.11-0.3x>=0
    14+0.2x>=0
    20.11-0.28x>=0
    20+0.25x>=0
    13.11-0.30x>=0
    14+0.20x>=0

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