3（2x-5）<=-x-1
    7/4x<=5/4x-1
    3x-8>2x+5
    x＋3≤2x+2
    3-2x+2＞0
    x/2+1≤X/3＋2
    8x+12(2x-4)<1200
    0.8x－0.8×270＜0.6x－0.6×270
    24—3X+3≥4X+6
    -3576.554684-108.2426*n+877.638*n*n/6+30.4512*n*n*n/6>0
    -3328.566344-201.8608*n+801.498*n*n/6+30.456*n*n*n/6>0
    -40.93868×n×n+6.672×n×n×n-671.86632-699.622×n≥0
    x-1<2
    3x+1>x-1
    3（2/5x+2）≥6-2（1-x）
    sinx-x<0
    20x-12002>0
    abs（x-2）＜3
    3^2-x-2≥0
    （x+2）/x≥2

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