x+1≥2
    （3x-1）/2≥2x+1
    x+5≤0
    x<=48-x
    3x+5(48-x)<=200
    1.5x+3.5(80-x)<=212
    5x+2.5(80-x)<=290
    x+2(10-x)>=13
    4x+2(10-x)>=30
    5x+2(10-x)>=30
    (0.7)^x<10^(-6)
     - 0.5x＋15＜5
    x＾3＋9x＾2＋x≤103
    x＾3＋9x＾2＋x≤102
    x＾3＋9x＾2＋x≤-1
    x＾3＋9x＾2＋x≤0
    x＾3＋9x＾2＋x≤105
    2x＾3＋18x＾2＋x≤105
    2x＾3＋18x＾2＋x≤117
    2x＾3＋18x＾2＋x≤120

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