2x>6 x+2>0
    5x^2+x-3≥15x
    x*ex-1＞1
    1-3(x-1<8-x
    -2*abs(x)≤sqrt(9)
    -2x≤sqrt9
    1+x+1/2*(x^2)+1/6*(x^3)+1/24*(x^4)<1
    (x-3)x≥5
    2-5x/6<2x-3/2
    3x-4＞5x
    2-1/2x≤x十3
    2（1-2x）<3（2x-1）
    x+3<2x-6
    3x+2<-6
    3-x/2≤7
    3-x/2≥3
     -3x一2<6
     2x一4<-6
    x1^2-6*x1+4*x2-11<0 exp(x1-3)-x1*x2+3*x2-1<0
    7(x-1)<4x-1 6(2/3*x+1)>=2x

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