4x－3>x+6
    X+2≥3x/2+1
    lna＋a＝－1
    p+4≤1
    (60-2x)(5+x)>300*1.5
    60x+192<109.9x^3
    {4.5-2x}/1.5-{3-7x}/2≥{3x+0.2}/0.3
    log(3,27)
    arccos0.5
    t
    {1.8-8x}/1.2-{1.3-3x}>{5x-0.4}/0.3
    sqrt(2-4x) <= 0
    32-x÷30=1/10
    (x-2)÷3-(3x+5)÷2≥x-(2-x)÷3
    b>5
    (x-2)÷2≤(7-x)÷3
    200x+100(34-x)>=4000
    （a+1）（2a+3）=0
    －x－12≤0
    3(x-2)+5<4(x-1)+6

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