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)
    39712.68+450.35+0.0672x+0.1x=x
    41140.68+462.49+0.0672x+0.1x=x
    41308.68+463.92+0.0672x+0.1x=x
    （X-1.472）*200-0.1=1
    13237.56+150.12+0.0672x+0.1x=x
    13713.56+154.16+0.0672x+0.1x=x
    13769.56+154.64+0.0672x+0.1x=x
    3x^2-6x=1
    2.254=1079.8/(1074.8-x)

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