2x+（29-2x）=29
    x*9%+x=18000000
    58+88+20x+40(x+0.05)=160
    20.98*1000=16.1*x(110-x/2)
    230.98*1000=16.1*x(110-x/2)
    0 = -0.5165x + 8.7193
     x^2+0.052x-0.10044=0
    136000=X+X/11.3+3840+950+350+500
    90+41*((1+x)^7-1)/(x*(1+x)^7)+7/(1+x)^7=41*((1+x)^13-1)/(x*(1+x)^13)+10/(1+x)^13
    √x
    x^4+5.6*10^-2*x^3+(5.6*1.5*10^-6-5.6*10^-3-10^-14)*x^2-(5.6*10^-16+11.2*1.5*10^-7)*x-5.6*1.5*10^-20=0
    x^1.5-1.33918*x^1.44=0.7374
    6% - 4% =（F-1.5762）/1.5762 × 12/4
    (797760+X)/3/545800.16=(2045216.21+2678400-X)/15.17/247635.58
    （797760+X）/(3*545800.16)=(2045216.21+2678400-X）/(15.17*247635.58)
    （797760+X）*545800.16/3=（2045216.21+2678400-X）*247635.58/15.17
    （797760+X）*545800.163090129/3=（2045216.21+2678400-X）*247635.577777778/15.17
    0.3Q^2-4Q+15=55
    0.3Q^2-4Q-40=0
    (797760+X)/3=(2045216.21+2678400-X)/15.17*3

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