(1.0615)^5=(1+x)*(1.056)^4
    (1.0615)^5=(1+x)*((1+1.056)^4)
    (1.0615)^5=(1+x)*(1+1.056)^4
    84.1 = 36.197ln(x) - 3.2495
    50 = 36.197ln(x) - 3.2495
    (1+6.15%)^5 =(1+x)*(1+5.6%)^4
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=94.187
    109*(1-X)=46
    960*100+240（350x-250）=0.86*100*1200
    84.1 = 37.363ln(x) - 8.3033
    50= 37.363ln(x) - 8.3033
    （1+x）^12=1.12
    （26.813+x）×2.75＝53.627+72.74-x
    （26.813+x）×2.75＝53.627+72.24-x
    972=x+88+0.3%*（x+88）/（1-0.3%）
    x^3+3*x^2-6*x-4=0
    13-4x^2
    5*x^2-26*x+32=0
    5*x-5*x^2=-8.75
    x^2-3x+1.75=0

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