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
    （3/5）:（6/7）=x:1.25
    (88x/46)+56(9.2－x)/46=20(9.2－x)*110/46+20x+80*96x/46
    12.9×c=（3.3+c）×7.93

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