2x－1－x≥3x－1
    3x－6+4＜5x
    5x－5≤2x
    2x+5≤3x+6
    -8/x>-x-2
    2x＜x+2
    -(8/x)>-x-2
    3x－1＞4
    5x≤4x－1
    x2+2x<8
    x-1>4x+2 (2x+1)/3>2x
    3(2x-1)>4x-5 ((3/2)x)-1<0.5x
    3(x-1)<5x+1 (2x+1)/3>2x-5
    2x+1>-1 (2x-1)/3>x-1
    ((7-x)/2)-3>((3+4x)/5)-4 ((5/3)x)+5(4-x)<2(4-x)
    3x+4>2x ((x+2)/5)-((x-3)/4)>1
    (x-3)/2+5>=x+3
    3x+2>2x 1-((x-1)/3)>(x+1)/2
    17x+10(80-x)≤500
    3x-1>x+4

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