Mathematics
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    -x^2+2x-1<0
    -x^2+2x-1>0
    mx^2-mx+2>0
    (2x-3)^2-4≥0
    x^2+x≤3000000000000
    (600000000-4x)/x>4.3
    (6000000-4x)/x/90=1
    9×a^2-a-28≤0
    (2x-1)/(x+2)<1
    (21.3+x)-[(21.3+x)*20%]>21.3
    21.3+[(21.3+x)*20%]>21.3
    21.3+[(21.3+x)*20%]≥21.3
    abs(x+2)(3x-1)≥0
    (x+7)/(x^(2)-2x+3)≤1
    -x^2+7x>6
    2+1/x≥0
    (1+4x)/(x-2)≥1
    1≤abs(x-2)<7
    2x^2+2-5x>0
    x^(3)-x-4=0

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