X+X*0.13=2500
    x／（x-2）+1/（2-x）＝3
    X-0.05X=318.07
    （6655.84-X-6150）/6150*0.5=(2026+X-3716.13)/3716.13
    a=10.69*(50221-(1.04+0.08a/300/97.2)^4)
    x=10.69*(50221-(1.04+0.08x/(300*97.2))^4)
    x=10.69*(50221-(10.4+0.08x/300/97.2)^4)
    -12500-(50000+x)*1%+X=5000
    -4114150+300000+X-450000-X*2.5%=300000
    x=10.69*(50221-(1.04+0.08x/300/97.2)^4)
    （a+5）×2+5a=66
    x-74
    x-74/77-x=2/1
    -4114150+300000+X-450000-X*2.5%=300000
    -4114150+300000+X-450000-X*10%/4=300000
    （x+5）（x+2）+66=2x+66
    （x+5）（x+2）=2x+66
    （x-5）（x-2）=2x+66
    （x-5）（x-2）=x2+66
    （x-5）（x-2）=66

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