2/3x+2>0
    5/12-（x-1）/3<=x/6
    （2x）/7-3/2>（5x-6）/14
    （3x+5）/4>（-11x-49）/16
     7+5>=13-2
    n^2-10n+9小于0
    (x^3+4)/3x<3
    3X-2≤19-X
    3X-2X≤19-X
    5X-10＞2X-4
    2(X+2)2X
    2-3x≥2x-8
    2-3x≥-6-2x
    m^-5m-14＞0
    400x+280(5-x)<=1900
    m-5(m-80)/3+5<5
    3n+80-5n+5<5
    8x-21>35
    2x-3<=35
    4x-9<=35

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