20238+1613x＝2142x
    4500000*0.25=50000*x*（1-0.05）-4500000
    4500000*0.25=50000*x*（1-0.05）-4500000
    25525x+283.53=45208x+101.42
    25525x+283.53=45208x+101.42
    25525x+283.53=45208x+101.42
    25525x+283.53=45208x+101.42
    25525x+283.53=45208x+101.42
    25525x+283.53=45208x+101.42
    25525x+283.53=45208x+101.42
    25525x+283.53=45208x+101.42
    25525x+283.53=452082x+101.42
    45.198x+82.238=-18.5x+255.5
    x^3-3x^2
    x^3-3x^2
    2(2x-1)=1-(3-x)
    307700=1060*x*（1-0.05）-800000
    0.04x+x=100
    X*X+X=1482
    V＝11846.49-1525.50-355.39-15.26-552.64-66.32-（V*0.037*2+(1,525.50+15.26)*0.037*2/2）-（V*0.0406*2+(1,525.50+15.26)*0.0406*2/2）-1725.55

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