-21.5+x-x*10%/4-30*10%/4=50
    X*0.03=x-75
    P＝9879－（3.05%×P＋3511.20＋105.34+296.37＋0.1539P＋284.30＋914.44-0.0921P）－1975.80
    x=1200+96+38.88+0.04x+19.59+0.0006x+0.06x+203.17+0.0061x
    x=1200+96+38.88+0.04x+19.59+0.0006x+0.06x+203.17+0.0061x
    x=1200+96+38.88+0.04x+19.59+0.0006x+0.06x+203.17+0.0061x
    x=1200+96+38.88+0.04x+19.59+0.0006x+0.06x+203.17+0.0061x
    x=1200+96+38.88+0.04x+19.59+0.0006x+0.06x+203.17+0.0061x
    x=1200+96+38.88+0.04x+19.59+0.0006x+0.06x+203.17+0.0061x
    x=1200+96+38.88+0.04x+19.59+0.0006x+0.06x+203.17+0.0061x
    x=1200+96+38.88+0.04x+19.59+0.0006x+0.06x+203.17+0.0061x
    x=1200+96+38.88+0.04x+19.59+0.0006x+0.06x+203.17+0.0061x
    x=1200+96+38.88+0.04x+19.59+0.0006x+0.06x+203.17+0.0061x
    X*0.03=x-2037.5
    x＝9879－（3.05%×x＋3511.20＋105.34+296.37＋0.1539x＋284.30＋914.44-0.0921x）－1975.80
    X*0.03=x-25
    X*0.03=x-250
    426x+x^2=4900
    426x+x^2=3848.45×4/π
    426x+x^2=3848.45×4/π

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