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
    20+0.50x>=0
    20.11-0.20x>=0
    -1x≥-6
    （2x+3)(x-4)<0
    （√xlnx）/（x-1）＜1
    21.35-0.25x<=25
    20.11-0.16x<=20
    7-x>1
    20+0.25x<=39.4
    5（x－2）≥4x
    abs((x+1)/(x-1))<1
    21.35+0.25x<=25
    7x+12>3x

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