x-2>-3x-1
    2x-7<0
    (2-6x)/9<(1+6x)/6
    2a-4
    abs(X-1)+abs(X-2)≥X+1
    1/7y－8≥－12
    3x^2-10x+e^x<0
    x^3-5x^2+e^x>0
    x^3-5x^2+e^x<0
    sin(2x)>x
    X^2 <3
    ln(x^4+5x^3+x^2-7x+28)<0
    200-0.4x<0
    200x-0.2x^2>0
    1<=3^x
    1<=3^x<=3
    (x^4+1)^(1/2)+x^3-3x<0
    x^2-13x+30≤0
    (4x^3-4x)*e^(x^4-2x^2+1)<0
    e^x-4x^3>0

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