Mathematics
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    x^2-5x+6>=0
    x^2+4x-21>0
    m^2-20m+64≥0
    3x/2-1>=x+4/2 10-x>7
    x^2-2x-8>0
    2x+7<0
    m^2>=16
    k^2>=8k
    x^2+12x+11>0
    (20+2x)(40-x)>1500
    x^2+4x <0
    x^2-4x <-3
    x^2-4x<-3
    -x^2-4x+6>0
    2x^2-x>1
    x×x-x+2<0
    k^2+k+2<=8
    x^2-3x+2>0
    -5x^2-5x-4<0
    a^2+16a<0

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