3（x-2）<=8-4x
    （x-3）/2+3>x+1
    1-x/3>=5-（x-2）/2
    （x+2）/3>（x+6）/5
    x/2-1>7-3x/2
    x/2-1>3x+3
    5x-2>3（x+1
    （2x+1）/3-（x-1）/6<1
    3（x+2）-8<=4x
    5-2x<15-4x
    x-7>4x+2
    x/2-1/3>=x
    1-2（x-1）>1
    x^(2)+x-20>0
    x^(2)+x-20=0
    e3=5
    e3
    3<3/10
    x-1/5
    4x-5<2(x+(1/2))

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