(1-x)(0.85*49x-36+36x)=36-36x
    x+5x/10=819
    x+5x/10=1455
    x+5x/10=58
    （x-2000)*10%-25=55.39
    X-953.66-[(x-953.66-5000)*0.03=11640.95
    (X-953.66-5000)*0.03=55.39
    2x^3-3x^2-x+1=0
    i^2
    x^2+1=0
    -19340000+5669500x=770100+267500x
    -19340000+5669500x=770100+267500x
    -19340000+5669500x=770100+267500x
    （23,050-x）/x=24.5%
    cc
    ((15.6863861*30)-16.102+(((X*100-55)/45)^2*16.6)/30)=15.695
    ((15.6863861*30)-16.102+(((X*100-55)/45)*16.6)/30)=15.695
    ((15.6863861*30)-16.102+((X*100-55)/45)*16.6)/30=15.695
    X-1907.32-[(X-1907.32-15000)*0.03]=23281.9
    X-953.66-[(X-953.66-5000)*0.03]=11640.95

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