Mathematics
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    2x²-x-1≥0
    (3x+5)^2<(2x-3)^2
    0<(3+x)/(3-x)≤1-x
    (2-5x)^2>4(x-3)^2
    (3+x)/(3-x)≤1-x
    x≤100 a≥(2000-10a)/(90-a)
    13a+4.8*(20-a)<=216
    x^2+x+-12 >= 0
    x^2+x+12>=0
    x^2+16x+2<0
    lnx+1>0
    e^x+1+x<0
    (1/x)+2>(4/x)-4>3x
    x+114514<1919810
    lnx>log(x,lnx)
    20-0.4x≤x
    3+7/(4∧x-1)>0
    3+7/4∧x-1>0
    (3-x)/x≥2
    0.5^x%18^(1/3)>x^3-3

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