Mathematics
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    9a∧-2a-7≤0
    2a>4
    (2-2x)(x+1)≤0
    (1567.5+2*x)/19.5 > 90
    x^2-2*abs(x)>0
    sin(cosx/3)>1
    3x/x+1≥sinx
    4x²-13x<0
    x^2-3x+2
    
20x+30(8-x)≥210 (90-20)x+(130-30)(8-x)≤770
    x^2-4x-5<0
    2^x+1>1
    ln(x + 5)^x < 6
    ln(x + 5) / ln(x) < 1
    ln(x + 5) / x < 0
    ln(x + 2) / x < 0
    ln(x + 1) / x < 0
    lnx / x < 0
    e^x / x > 5
    xlnx<1

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