1800-15*(9-x)^2<=1500
    x^4-e^2x^2<2e^3(x-e)
    -71810+6000+x-(20000-6800+x)*0.1/4-6300 >3000
    10X+15（100-X）=1000
    3^(x-2)×2^(x+1)=10^x
    3^(x-2)+3^(x-1)+3^x=|1701|
    620.3-x-885*2%≥10
    -4082750+3000000+x-x*2.5%-450000≥300000
    1/3
    3/4
    1+2
    (2x^2-3)÷(4x^2+4x-1)≥0
    Y-Y/1.03×3％×1.1=1000000
    20x+6＞0
    -857+x-x*8%/4≥10
    0.6X+150 = (0.4X+150)*1.4
    x-10/x=0.1
    1+10e2.1x+10e3.43xe2<10
    -X^2+150X≥794
    5000/1100<((1+x)^10-1)/x(1+x)^10

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