-3＜3/x
    -2x^2+5x+7>=0
    (x-3)(7-x)>0
    10x＜0
    √3x-2≥0
    62.5×10/X≤50
    0.05x>1
    0.5x>1
    (x+0.04x+0.1*(x+0.04x))*0.063>((x+0.04x+0.1*(x+0.04x))*(1+1.8%)+0.05x)*0.0501
    (x+4%x+10%*(x+4%x))*0.063>((x+4%x+10%*(x+4%x))*(1+1.8%)+5%x)*0.0501
    5a^2-6a+1<0
    4a^2-6a-33>0
    2x^2+x>0
    n+(n-1)*12>=3000
    n+(n-1)*12<=3000
    n*30+(n-1)*12<=3000
    n*30+(n-1)*12>=3000
    0.125
    15 - 0.1x - 0.78sqrt(x) >= 0
    15 - 0.1x - 0.777sqrt(x) >= 0

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