x2+10x-20＜0
    (3x-1)e^x<(4/(3e))(x-2)
    (3x-1)e^x-((4/3e))(x-2)<0
    (3x-1)e^x-(4/3e)(x-2<0
    (3x-1)e^x-(4/3e)(x-2)<0
    (3x-1)e^x-(4/(3e))(x-2)<0
    (3x-1)e^x-(7/(4e^2))(x-2)<0
    280x+1000/x－50000≥400000
    (3x-1)e^x-2(x-2)<0
    (3x-1)e^x-(1/2)(x-2)<0
    (3x-1)ex>1
    x2+2x＞3
    11m^2 -2m +11>0
    (m-3)(m-3)+4(m*m-2m-3)<0
    m*m-2m-3<0
    x^2+x-1
    x^2+x-1<0
    x^x<0
    65a/5≥1950
    66a/5≥1950

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