x^5=1.3^x
    x^5=1.0001^x
    x=(2sinx)/x
    1=x^2+x^3
    x^2=3
    x^6+6x^4+19x^2-24=0
    x^3+6x^2+19x-24=0
    xlnx=1+x
    x^3+2x^2+x+2＝0
    sqrt(2a/9.8）+a/340=6
    4x^3+3x^2+4x+3＝0
    4x*3+3x*2+4x+3＝0
    x^3+2x^2+5x+1=0
    2x^2+5x+1=0
    2x^2+5x+2=0
    x^2-2*x+ln(x)-1=0
    （119-x）/193 = 0.40
    （119-x）/（193-x）=0.40
    x+4+20+15%x+（x+15%x）*13%=2600
    (0.01x + 220) * 45 = x

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