x+3>15
    x+3>7
    xx+5x+9>3
    60-a>=38 135a+180(60-a)<=9900
    60-a>=38
    26700+A-A×10%/4≥50000
    -12500-50000*12%/12+X*12%/12>5000
    2x-x^2>=0
    2x-3≤-1
    -（2x-3）≥1
    2x-3≥1
    2-3x≤7
    -（2-3x）≤7
    45.99+0.78*(x+188)/2 > 188-5.29
    45.99+0.78*(x+188)/2 > 188
    x^2-2x-3≥0
    1÷（3-x）≤0
    x^2-x＜6
    0.2*0.95^x＜0.10
    0.2*0.95^x≤0.10

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