16*10^3x^2-125x+225*10^-3=0
    X/2=6000+(x-6000-3500)/2
    X=68708-(1680+17.8%X)
    X=68708-(1753+17.8%X)
    X=70664-(3674+17.8%X)
    X=70664-(2004+17.8%X)
    X=70664-(1879+17.8%X)
    X=70664-(1753+17.8%X)
    X=68708-(1566+17.8%X)
    X=68708-(1628+17.8%X)
    X=68708-(1817+17.8%X)
    X=68708-(1942+17.8%X)
    X=68708-(1879+17.8%X)
    X=19820-(1879+17.8%X)
    X=39376-(1879+17.8%X)
    X=36931-(1879+17.8%X)
    x*x-9＝(4-x*x)
    xx-9＝(4-xx)
    x2-9＝(4-x2)
    x^2-3^2＝(4-x^2)

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