5*（31+x）+6/36+x=4.9
    【（5000-4713）/4713】/（【P-507）/507】=-2
    【（5000-4713）/4713】/（P-507）/507=-2
    24^(1-1/k)=3
    1.22x^2-2.2x+1=0
    (x-131)/x=5%
    x+6%x=1449900
    x+6%x=1450000
    (x-88.88)/x=10%
    (x-117.90)/x=10%
    lnx-2/x+2=0
    4×x^1+4×x^0
    2977*3.1415926*0.00636*（45-x）^0.75 = 59*0.451*（x-30）
    2977*3.1415926*0.00636*（45-x）^0.75=59.67*0.451*（x-30）
    (x-88.88)/x=11%
    (x-16.86)/x=77%
    (x-16.86)/x=70%
    x^3+4*x^2+5*x+3=0
    (x-30.46)/x=70%
    (x-57.26)/x=40%

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