X+2=3+x
    10/89.14+6/133.58+4/50+20/200+X/1000+（57.3-X）/1650=0.346
    10/89.14+6/133.58+4/50+25/200+X/1000+（52.3-X）/1650=0.346
    X-2=3+x
    X-2=3-x
    0.69*0.79*x*1.3*1.05=2.82
    0.69*0.79*x*1.05=2.82
    0.65*0.66*x*1.01=1.51
    137460421800/2813=x
    0.65*0.66*x*1.01=2.4
    234975.08=(0.625*(x/117))-((0.624*(x/117))/10)
    0.65*0.66*x*1.01=2.4
    3=x+2
    6（1160-3x）^2=x
    （1-a)a=0.55
    x^-0.3
    10%x-(1700-x)5%=35
    750=-38.29X^2+1657.2X-16791
    35+16L-3L^2=0
    700=-38.29X^2+1657.2X-16791

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