x/578+x/2080=22
    x/578+x/2080=22
    x/578+x/2080=22
    x/578+x/2080=22
    x/578+（x+4000）/2080=48-26
    80000a=64000*(a+400)
    x/578+（x+4000）/2080=48
    x∧3+2x∧2+x+1＝0
    （600/x）-（600/1.25x）=3
    600/x-600/1.25x=3
    lnx+1-2x=0
    0=lnx+1+2x
    5ln100-5ln9＝6ln50-6lnx
    5＝6*［（ln50-lnx）/（ln100-ln9）］
    6lnx＝10ln3+2ln5-4ln2
    invX=0.014904
    tanX-X=0.014904
    tanX-X=-0.0045515
    tanX-X=-0.0045515
    invx=-0.0045515

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