3/4*x>x/4-2
    （x-1）/5
    4x+5<=3（x+2）
    (x-3)/2-1<0
    1/2x-1<=7-3/2x
    2x+1≥-3, 1/3x<0
    5-(x-3)≥0
    x-1>0, -2x≥4
    x-1>0, -2x≥
    1/3x<=2
    3x+2>x
    3X-6＞0
    x-4<=4-2x
    8-4x<0
    2x-1>=5
    （x-2）（x+3）>0
    3x-2>0
    1/x+1>0
    195+3.75x-0.0031x^2≥400
    x/3+8>3-x

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