x/4≥（x-1）/3
    3（x+2）＞x+8
    x+3（x-1）＜1
    2x-1>0 x+1<=3 -3x-1>3 2x+1>3 3(x-1)+13>5x-2(5-x) 5-(2x+1)<3-6x x-3(x-2)>=4 (1+2x)/3>x-1
    （1+2x）/3＞x-1
    4-2x＜0
    x-1≥0
    4x-1＞x+2
    2x＜8
    x-5≤0
    4-2x≤0
    2x+1＞0
    x+1>3 x-1>3 x+1<3 x-1<3
    （x+3）/3-x≤-1
    3x＜2x+4
    X－5＞8
    x/x+1<2/x+2
    6x-5<0
    (2a-7)/3>-16/3a
    2x+9>6x+1

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