Mathematics
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    (500-x)*15<1893
    sinx>ln(1+x)
    -2<(1-1x)/5<3/5
    -2<1-1x/5<3/5
    40a+20(10-a)≥260 10a+20(10-a)≥150
    -50-x+(100+x)*1% ≥10
    -50-x(100+x)*1% ≥10
    -50-x(100+x)*1% >10
    x-50-(100+x)*1% >10
    x-50-(100+x)*1%≥10
    log2x<-2
    ln(3x+4)≥0
    0.1x+15<0.15x
    2(2(2x+10)+10)+10>18
    5-1/2(x+4)>=x
    2x-7<3(x-1)
    m≥2(100-m)
    x^3+x^2+x^1>9
    (x+2)/3>(2x-1)5
    (1+4x)/3>x-1

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