(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
    (2x-1)/5<(x+1)/2
    x-3(x-2)≥4
    [(3x-1)/2]-(7/3)≥x-[(5+2x)/3]
    (2x一3)÷3<(5-x)÷2

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