Mathematics
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    1+x+x^2<1
    0.5*4.5x+0.4*(15-4.5x)/3<=5.2
    (x-2)(1-3x)>2
    -10x²+210x-800≥280
    x+2/x-5≤0
    2x-3/x-5≤0
    ln(2x+6)≥0
    ln(2x+6)>0
    2x+6>0
    2^x+x>1
    2(x^2+5/2x)-3<0
    2(x^2+2/5x)-3<0
    2x^2+5x-3<0
    -1<1-a<1
    -1<2a-1<1
    -1<2a-1<1-a<1
    (5000-50x)>10x^1/2
    (1+1/x)^ln(1+1/x)<2
    2^x>15
    10000/(X+12.36)+10000/(X+20.6)≤150

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