100x=540+(20+5)x
    25x+54000-x=46000
    200x=2000+(160+78)x
    0.9*x-0.588*x^(1/2)=100
    0.9*x-0.288*x^(1/2)=100
    0.9*x-5.88*x^(1/2)=100
    0.9*x-2.88*x^(1/2)=100
    141.6*（1+r-2*0.995r）＝1+r
    log x=6.7
    0.992*（1+2*x）＝1
    log x=4.31
    log x=3.376
    logx=4.31
    141.6*（1+r-2r*0.997）＝1+r
    logx=3.376
    200*（1+r-2*0.995r）＝1+r
    lnx＝0.14
    63=x+x*13/100
    2x-1＝0.6（3x+4）
    111=x+x*13%

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