3x-8>4-x
    0.5x-2>1.5x-5
    (4x+2)/5≥(x－1)/2
    2x+6>7x－4
    (x+2)/2-1
    2-3x<5-x
    (x+3)/5<(2x-5)/3-1
    1/2x≤2+1/3x
    1/2x≤2+1/3
    x＋5≤4x-4
    3x＋5>x-1
    x-1>2
    a+1=a/2+2
    1＋2(a－1)＋a^2>0
    -2x≤6+x 5x-1>3(x-1)
    5500×60+5000（X－60）>550000
    -2x<4
    1x-3x*1x/4x>520
    x>-4 x ≤ 2
    xy≤ax^2+2y^2 1≤x≤2 2≤y≤3

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